Abstract: A process for preparing an alcohol of the formula: ##STR1## by reacting a carbonyl compound of the formula: ##STR2## or an oxirane of the formula: ##STR3## magnesium and a propargyl halide of the formula: ##STR4## followed by hydrolysis, characterized in that the carbonyl compound (II) or the oxirane compound (III) and the propargyl halide (IV) are reacted simultaneously with magnesium in an inert solvent in the presence of zinc or a halide thereof.

Abstract: An ascorbic acid or erythorbic acid derivative represented by the following general formula: ##STR1## wherein n represents an integer of 4 to 20; and a process for producing said ascorbic acid or erythorbic acid derivative which comprises heat-treating 2,5,6-triacyl-substituted-ascorbic acid or -erythorbic acid represented by the following general formula: ##STR2## wherein n represents an integer of 4 to 20, in the presence of water and/or a lower aliphatic alcohol at a temperature of 30.degree. C. to 100.degree. C. and thereby selectively eliminating only the acyl group of the 2-position.

Abstract: 2-Substituted-4,6-di-t-butylresorcinol represented by the general formula: ##STR1## wherein R represents a straight or branched alkyl group having 1 to 20 carbon atoms, a straight or branched alkenyl group having 2 to 20 carbon atoms and at least one double bond, or an aralkyl group, wherein no tertiary carbon atom of R is directly bonded to the benzene nucleus, is prepared by allowing 4,6-di-t-butylresorcinol to react with a halogen compound represented by the general formula:RXwherein R has the same meaning as defined above, and X represents a halogen atom, excluding the X bonded to a tertiary carbon of R, in an aqueous alkali solution. By further debutylization of the 2-substituted-4,6-t-butylresorcinol, 2-substituted resorcinol represented by the general formula: ##STR2## wherein R has the same meaning as defined above, but the tertiary carbon of R is free from direct bonding to the benzene nucleus, is prepared.

Abstract: A process for preparing cyclopentenolones of the formula: ##STR1## wherein R.sub.1 is a straight, branched or cyclic alkyl group having not more than 6 carbon atoms, a straight, branched or cyclic alkenyl group having not more than 6 carbon atoms, a straight or branched alkynyl group having not more than 6 carbon atoms or a group of the formula: ##STR2## wherein R.sub.2 is a hydrogen atom, a methyl group or a halogen atom directly from the corresponding furan-carbinols of the formula: ##STR3## wherein R.sub.1 is as defined above in a single step with an excellent yield, characterized in that the furan-carbinols are treated with water in the presence or absence of a catalyst.

Abstract: In the production of a furfuryl alcohol of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl group and R.sub.2 is an allyl or .alpha.-methylallyl group, by combining the corresponding furfural of the formula: ##STR2## wherein R.sub.1 is as defined above, with magnesium and allyl chloride or .alpha.-methylallyl chloride into a reaction and hydrolysing the resultant product, the improved method wherein tetrahydrofuran or its mixture with at least one aromatic hydrocarbon is used as a reaction medium, and the furfural and allyl chloride or .alpha.-methylallyl chloride are simultaneously added to the reaction medium comprising magnesium, whereby the objective furfuryl alcohol is obtained in high yields.

Abstract: 2-Substituted-4,6-di-t-butylresorcinol represented by the general formula: ##STR1## wherein R represents a straight or branched alkyl group having 1 to 20 carbon atoms, a straight or branched alkenyl group having 2 to 20 carbon atoms and at least one double bond, or an aralkyl group, but the tertiary carbon atom of R is free from direct bonding to the benzene nucleus, is prepared by allowing 4,6-di-t-butylresorcinol to react with a halogen compound represented by the general formula:RXwherein R has the same meaning as defined above, and X represents a halogen atom, excluding the X bonded to the tertiary carbon of R, in an aqueous alkali solution. By further debutylization of the 2-substituted-4,6-t-butylresorcinol, 2-substituted resorcinol represented by the general formula: ##STR2## wherein R has the same meaning as defined above, but the tertiary carbon of R is free from direct bonding to the benzene nucleus, is prepared.