Shell Oil Comapny

Walter L Petty

Walter Dong

Leon Hunter

A cyanohydrination catalyst for the preparation of alphahydroxynitriles from aldehydes and ketones comprises a solid cyclo(D-phenylalanyl-D-histidine) dipeptide having a non-crystalline or amorphous component.

Cyanohydrination of an aromatic aldehyde

A cyanohydrination catalyst for the preparation of alpha-hydroxynitriles from aldehydes and ketones comprises a solid cyclo(D-phenylalanyl-D-histidine) or cyclo(L-phenylalanyl-L-histidine) dipeptide having a non-crystalline or amorphous component.

Cyanohydrination catalyst

Cyanohydrination catalyst comprising non-crystalline or amorphous

A method of preparing an 'A-alpha' single stereoisomer of an S-alpha-cyano-3-phenoxybenzyl S-alpha-isopropylphenylacetate by precipitation from a solution of an 'alpha' diastereoisomer pair, S-alpha-cyano-3-phenoxybenzyl R,S-alpha-isopropylphenylacetate, and optional hydrolysis of the mother liquor and recycle of the components thereof. The phenylacetate 'alpha' is prepared from the S-alpha-cyano-3-phenoxybenzyl alcohol and racemic alpha-isopropylphenylacetic acid or reactive derivative thereof.

Process for preparation of an S-alpha-cyano

A pesticidal phenylacetate Y enantiomer pair is prepared by precipitating crystals of novel phenylacetate X enantiomer pair in the presence of crystals of phenylacetate X from a solution of racemic phenylacetate and recovering the filtrate rich in the Y enantiomer pair. The phenylacetate X crystals can be redissolved, epimerized and the epimerizaion product recycled to improve the yield of phenylacetate Y enantiomer pair.

Process for preparation of a pesticidal phenylacetate enantiomer pair

An improved process for preparation of insecticidal esters of alpha-cyano-m-aryloxybenzyl alcohols is disclosed which includes the steps of preparing an acid chloride of the formula: ##STR1## by reacting the corresponding acid with thionyl chloride, purifying the acid chloride thus obtained by fractional distillation and reacting the purified acid chloride with a phenoxybenzaldehyde and a cyanide solution to yield the desired insecticidal product. In this improved process, the presence of difficult to remove ketene reaction products in the final insecticidal product is avoided by treating the purified acid chloride with an ahydrous hydrogen halide prior to reaction with the phenoxybenzaldehyde.

Removal of ketene impurities in the preparation of

This invention relates to novel polymers containing high energy groups comprising a polyether having the general formula ##STR1## WHEREIN EACH R is an alkyl or hydrogen and n is an integer from about 10 to 60. The preparation of these novel polyethers and their use as binder materials for high energy solid propellants is also described.

Poly(cyanodifluoroamino ethers), their preparation and utilization

1. A highly unsaturated polyether having repeating units having the structure ##EQU1## wherein R is a member of the group consisting of hydrogen and alkyl groups, and n is an integer greater than 2.

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Houston, TX, United States of America

Walter L Petty