摘要:
The new crystalline modification of 1,1',1"-nitrilo{tri-2-propyl-tris[2,2'-ethylidene-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.
摘要:
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.
摘要:
Substituted 3H-1,3,2-oxazaphospholidines of formula I ##STR1## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently hydrogen, alkyl, cycloalkyl, phenylalkyl or aryl, n is 1 to 4 and T is an n-valent aliphatic or aromatic hydrocarbon radical are effective in stabilizing organic materials against the deleterious effects of oxygen, heat and/or actinic radiation.
摘要:
3,7,9-Trioxa-1-aza-2,8-diphosphaspiro[4.5]decanes of formula I ##STR1## wherein R.sub.1 and R.sub.2 are independently hydrogen, alkyl, cycloalkyl, bicycloalkyl, tricycloalkyl or aryl; or can be halogen when n or m is zero,R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are independently hydrogen, alkyl, aralkyl or aryl;X and Y are independently --O--, --S-- or --NR.sub.16 -- where R.sub.16 is alkyl, cycloalkyl, alkenyl, aryl or aralkyl;W and Z are independently O or S; andn, m, o and p are independently zero or 1, are effective in stabilizing organic materials against the deleterious effects of oxygen, heat and/or actinic radiation.
摘要:
Disclosed are mixtures of oxyalkylene bridged bis- and tris-phosphite esters of formulae I and II where R is hydrogen or methyl, n and n′ are independently an integer from 1 to 45 and R1, R2 and R3 are each independently hydrogen, straight or branched chain alkyl of 1 to 12 carbon atoms, phenylalkyl of 7 to 9 carbon atoms, phenylalkyl of 7 to 9 carbon atoms substituted on the phenyl ring by one to three straight or branched chain alkyl of 1 to 12 carbon atoms or R1, R2 and R3 are each independently —(CH2)k—COOR4 where k is 0, 1 or 2 and R4 is hydrogen or straight or branched chain alkyl of 1 to 20 carbon atoms. The mixtures of formula I and II are liquid at ambient conditions and are effective stabilizers for polyolefins.
摘要:
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-naphthylamine. Sertraline has selective serotonin uptake inhibitor activity making it a valuable antidepressant pharmaceutical product.
摘要:
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.
摘要:
Catalyst systems which comprise a transition metal and a tris(organophosphite) ligand are particularly effective as catalysts for hydrosilation reactions.
摘要:
The new amorphous modification of 1,1',1"-nitrilo{tri-2-propyl-tris-[2,2'-ethylidene-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.
摘要:
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.