Abstract: 4-(3,4-Dichlorophenyl)-3,4-dihydro-2H-naphthalen-1-ylidene-methylamine and related analogs are prepared from .alpha.-tetralone by a facile three-step process. This compound is the required intermediate to prepare sertraline, (1S-cis)-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-N-methyl-1-naphthylamin e. Sertraline has selective serotonin uptake inhibitor activity making it a valuable antidepressant pharmaceutical product.

Abstract: The synthesis of new sterically hindered ferrocene bis(phosphonites) of formula I ##STR1## the synthesis of the corresponding transition-metal complexes and the use of these complexes in transition-metal-catalyzed reactions are described.

Abstract: Catalyst systems which comprise a transition metal and a tris(organophosphite) ligand are particularly effective as catalysts for hydrosilation reactions.

Abstract: The new crystalline modification of 1,1',1"-nitrilo{triethyl-tris-[2,2'-methylene-bis(4,6-di-tert-butylphenyl) ]phosphite} is obtained by crystallizing said compound from the melt at elevated temperatures. This crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene. The instant crystalline form exhibits better handling characteristics, apparent density, flowability, meterability, storage and hydrolytic stability than the prior art powdery product.

Abstract: The new amorphous modification of 1,1',1"-nitrilo{triethyl-tris-[2,2'-methylene-bis(4,6-di-tert-butylphenyl) ]phosphite} is obtained by cooling rapidly said compound from the melt to ambient temperature. This amorphous form is an effective process stabilizer for polyolefins, particularly polypropylene.

Abstract: Substituted 1,3,2,4-diazadiphosphetidines of formula I ##STR1## where preferably, R.sub.1 and R.sub.2 are branched alkyl or aryl, m and n are 1, p and q are 0, and YR.sub.3 and XR.sub.4 are substituted --O--phenyl or --N(alkyl).sub.2, are excellent stabilizers for organic materials, particularly polyolefins.

Abstract: Selected alkanolamine esters of acyclic phosphites are particularly effective as process stabilizers for polyolefins providing for melt flow stabilization and resistance to discoloration during said processing.

Abstract: The alpha crystalline modification of 2,2',2"-nitrilo triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl)phosphite! is obtained by crystallizing said compound from selected solvents, preferably from a mixture of an aromatic hydrocarbon solvent and a lower alkanol.The alpha crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.

Abstract: The new amorphous modification of 1,1',1"-nitrilo{tri-2-propyl-tris-[2,2'-ethylidene-bis(4,6-di-tert-butylph enyl)]phosphite } is obtained by cooling rapidly said compound from the melt to ambient temperature.This amorphous form is an effective process stabilizer for polyolefins, particularly polypropylene.

Abstract: The new crystalline modification of 1,1',1"-nitrilo{tri-2-propyl-tris[2,2'-ethylidene-bis(4,6-di-tert-butylphe nyl)]phosphite} is obtained by crystallizing said compound from the melt at elevated temperatures.This crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.

Abstract: The beta crystalline form of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl) phosphite] is obtained by the thermal treatment of the phosphite compound at 125.degree. C. in the absence of any solvent.The beta crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.

Abstract: Novel cyclic pyrophosphite of formula I ##STR1## are prepared from the corresponding 6-chloro and 6-oxo phosphepins or phosphocins. The cyclic pyrophosphites are effective process stabilizers for organic materials subject to thermal, oxidative or actinic induced degradation, particularly polyolefins and especially polypropylene.

Abstract: The gamma crystalline modification of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl)phosphite] is obtained by crystallizing or recrystallizing said compound from an alkanol of 4 to 8 carbon atoms.The gamma crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.

Abstract: 6-Chloro-2,4,8,10-tetrabutyl-dibenzo[d,f][1,3,2]dioxaphosphepin and related phosphorochlorites are prepared by reaction of an appropriate bisphenol with phosphorus trichloride in the presence of a catalytic amount of 1-methyl-2-pyrrolidinone in toluene followed by heating the solution and stripping off the hydrogen chloride formed by a flow of nitrogen.

Abstract: The amorphous solid modification of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl)phosphite] is obtained by melting said compound and rapidly cooling the melt.The amorphous solid is an effective process stabilizer for organic materials, especially polyolefins and particularly polypropylene.

Abstract: The beta crystalline modification of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl) phosphite] is obtained by crystallizing said compound from the melt at elevated temperatures.The beta crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.

Abstract: The alpha crystalline modification of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl) O"phosphite] is obtained by crystallizing said compound from selected solvents, preferably from a mixture of an aromatic hydrocarbon solvent and a lower alkanol.The alpha crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.

Abstract: The gamma crystalline modification of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl)phosphite] is obtained by crystallizing or recrystallizing said compound from an alkanol of 4 to 8 carbon atoms.The gamma crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.

Abstract: The beta crystalline modification of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tertbutyl-1,1'-biphenyl-2,2 '-diyl) phosphite] is obtained by crystallizing said compound from the melt at elevated temperatures.The beta crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.

Abstract: A stabilized composition of matter which comprises an organic material subject to oxidative, thermal or actinic degradation, and an effective stabilizing amount of a bisphosphite typified by formula I ##STR1## wherein n has a value of 0 or 1; Q is --CR.sup.1 R.sup.2 where R.sup.1 and R.sup.2 are independently hydrogen, alkyl or aryl; Y.sup.1, Y.sup.2, Y.sup.3, Y.sup.4, Z.sup.2, Z.sup.3, Z.sup.4 and Z.sup.5 are independently hydrogen, alkyl, cycloalkyl, aralkyl, aryl, cyano, acyl and hydrogen; and each Z represents an identical or different alkyl, aryl, aralkyl or alkaryl group.