Abstract: The present invention relates to a process for the preparation of 2,6-divinylpyridine and 2-methyl-6-vinylpyridine over modified zeolite catalysts. In particular, it relates to the method for the synthesis of 2,6-divinylpyridine and 2-methyl-6-vinylpyridine from 2,6-lutidine and formaldehyde in vapour phase in an eco-friendly method with high yield and selectivity. This invention provides a non-corrosive, eco-friendly process, where the catalyst can be reused for many times. 2,6-Divinylpyridine is useful stating material in polymer industry.

Abstract: The present invention provides an improved process for the preparation of ZSM-5 catalyst of the formula 3.25 Na2O. Al2O3.30SiO2.zH2O where z=15-20 water molecules per unit cell by autoclaving a mixture of a pre-prepared seeding gel comprising a mixture of a alkali metal cation, an alkali hydroxide, and a silica source in water, and further amounts of silica source and an aluminium source in the presence of an organic solvent with water as a co-solvent.

Abstract: The present invention relates to a process for the preparation of 2,6-divinylpyridine and 2-methyl-6-vinylpyridine over modified zeolite catalysts. In particular, it relates to the method for the synthesis of 2,6-divinylpyridine and 2-methyl-6-vinylpyridine from 2,6-lutidine and formaldehyde in vapour phase in an eco-friendly method with high yield and selectivity. This invention provides a non-corrosive, eco-friendly process, where the catalyst can be reused for many times.

Abstract: The present invention relates to an improved eco-friendly process for the preparation of vinylpyridine from corresponding picoline over modified zeolite catalyst in vapour phase which comprises reacting picoline with formaldehyde with a molar ratio of formaldehyde to picoline in the range of 1:1 to 4:1, at a temperature ranging between 200° C. to 450° C., at a weight hourly space velocity in the range of 0.25 hr−1-1.00 hr−1 over a modified commercial zeolite catalyst to obtain a high yield and selectivity of the desired product.

Abstract: The present invention relates to an improved eco-friendly process for the preparation of vinylpyridine from corresponding picoline over modified zeolite catalyst in vapour phase which comprises reacting picoline with formaldehyde with a molar ratio of formaldehyde to picoline in the range of 1:1 to 4:1, at a temperature ranging between 200° C. to 450° C., at a weight hourly in the range of 0.25 hr−1-1.00 hr−1 over a modified commercial zeotlite catalyst to obtain a high yield and selectivity of the desired product.

Abstract: The present invention provides an innovative method based on reaction cum separation on single plate concept for efficient evaluation of porphyrins, calix(4)pyrroles and allied macrocycles by in-situ synthesis from pyrrole with aromatic aldehydes and ketones over zeolite based molecular sieve catalysts as sorbents in thin layer chromatography (TLC) using microwave heating. This glass backed zeolite coated TLC plate acts as a micro reactor as well as separator for the in-situ synthesis and chromatographic separation of macrocycles. The process is simple, economical, rapid, selective and finds a possible application in high throughput parallel synthesis and screening on a single micro plate employing microwave irradiation.

Abstract: The present invention provides an improved process for the preparation of ZSM-5 catalyst of the formula 3.25 Na2O. Al2O3.30SiO2.zH2O where z =15-20 water molecules per unit cell by autoclaving a mixture of a pre-prepared seeding gel comprising a mixture of a alkali metal cation, an alkali hydroxide, and a silica source in water, and further amounts of silica source and an aluminium source in the presence of an organic solvent with water as a co-solvent.

Abstract: The present invention provides an innovative method based on reaction cum separation on single plate concept for efficient evaluation of porphyrins, calix(4)pyrroles and allied macrocycles by in-situ synthesis from pyrrole with aromatic aldehydes and ketones over zeolite based molecular sieve catalysts as sorbents in thin layer chromatography (TLC) using microwave heating. This glass backed zeolite coated TLC plate acts as a micro reactor as well as separator for the in-situ synthesis and chromatographic separation of macrocycles. The process is simple, economical, rapid, selective and finds a possible application in high throughput parallel synthesis and screening on a single micro plate employing microwave irradiation.

Abstract: The present invention relates to novel calix pyrroles and a process for synthesis of calix (4) pyrroles by reacting pyrrole with cyclic or acyclic ketones in dichloro methane (DCM) solvent over molecular sieve catalysts which provides an eco-friendly, more economical and selective heterogeneous method.

Abstract: The present invention relates to enhancement of the cycle life of a zinc chromium based catalyst used in the synthesis of 2-methylpyrazine by increasing the reaction temperature step-wise, starting from a low temperature, while monitoring the levels of total conversion and selectivity towards pyrazine. The catalyst can be regenerated after each cycle of use without substantial loss of activity.

Abstract: Disclosed is a process for selectively producing aliphatic cyclic amines which comprises reacting a dihydric alcohol characterized by four to six carbons, preferably 1,5-pentane diol, with excess ammonia in presence of ZSM-5 catalyst modified with group of elements nickel, copper or cobalt-containing, at a temperature of at least 250° C., wherein said catalyst incorporates at least one metal.

Abstract: The present invention provides an improved process for synthesis of porphyrin compounds of the general formula 1 from pyrrole and aromatic aldehyde over zeolite molecular sieve catalysts using microwave heating, (solvent free) to provide an eco-friendly, economical, faster and selective heterogeneous method.

Abstract: This invention relates to process for producing annulated pyridine bases by reacting cyclic ketones with aliphatic aldehyde in presence of ammonia in gaseous phase in the presence of a catalyst. This process provides an eco-friendly, more economical and highly selective heterogeneous method.

Abstract: The present invention provides a process for synthesis of tri- and tetra-alkylated pyridines (i.e. collidines) in high yields by reacting methyl ethyl ketone with formaldehyde in presence of ammonia in gas phase in the presence of a zeolite catalyst which comprises of silica-alumina with at least one metal ion and/or metal selected from the group consisting of lanthanum, lead, manganese, iron, copper and cobalt. This process provides eco-friendly, more economical and shape-selective heterogeneous method.

Abstract: The present invention provides an improved process for the synthesis of aryl pyridine bases by reacting an aromatic aldehyde or ketone and allylic alcohol or aldehyde in presence of ammonia in gas phase, in high yield and selectivity with catalyst obtained by optionally modifying a zeolite having an atomic ratio of Si to Al, 2.5 to 12.5 and /or with at least one metal ion and/or metal compound selected from the group consisting of lead and lanthanum. This process provides an eco-friendly, more economical and highly selective heterogeneous method.

Abstract: Disclosed is a process for selectively producing aliphatic cyclic amines which comprises reacting a dihydric alcohol characterized by four to six carbons, preferably 1,5-pentane diol, with excess ammonia in presence of ZSM-5 catalyst modified with group of elements nickel, copper or cobalt-containing, at a temperature of at least 250° C., wherein said catalyst incorporates at least one metal.

Abstract: The present invention relates to novel calix pyrroles and a process for synthesis of calix (4) pyrroles by reacting pyrrole with cyclic or acyclic ketones in dichloro methane (DCM) solvent over molecular sieve catalysts which provides an eco-friendly, more economical and selective heterogeneous method.

Abstract: The present invention provides a process for synthesis of tri- and tetra-alkylated pyridines (i.e. collidines) in high yields by reacting methyl ethyl ketone with formaldehyde in presence of ammonia in gas phase in the presence of a zeolite catalyst which comprises of silica-alumina with atleast one metal ion and/or metal selected from the group consisting of lanthanum, lead, manganese, iron, copper and cobalt. This process provides eco-friendly, more economical and shape-selective heterogeneous method.

Abstract: This invention relates to process for producing annulated pyridine bases by reacting cyclic ketones with aliphatic aldehyde in presence of ammonia in gaseous phase in the presence of a catalyst. This process provides an eco-friendly, more economical and highly selective heterogeneous method.

Abstract: The present invention provides an improved process for synthesis of porphyrin compounds of the general formula 1 1