摘要:

Two reports in which it was claimed that the 1-acyl group of a 1-acyl-2-thiohydantoin was not rapidly removed by dilute acid or alkali were investigated and found erroneous.

ISSN:0008-4042    

DOI:10.1139/v68-011

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

Tetra-n-butylammonium salts effect the nuclear magnetic resonance response of the para and meta protons of nitrobenzene to a greater extent than that of the ortho protons in solutions in carbon tetra chloride. It is suggested that this effect may be due to a specific interaction between the salt, in ion-pair form, and the aromatic ring of nitrobenzene.

ISSN:0008-4042    

DOI:10.1139/v68-012

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

The conversion of isomyristicin to a Schiff base of myristicinaldehyde is described. The subsequent hydrolysis of this base to the free aldehyde establishes a convenient preparation of this material. Apiolealdehyde is similarly generated from isoapiole, suggesting that this procedure may have general application in the conversion of the natural aromatic ethers of essential oils to the correspondingly substituted benzaldehydes.

ISSN:0008-4042    

DOI:10.1139/v68-013

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

The syntheses of 3-methoxy-l,3,5(10)-estratrieno[16,17-c]furoxan (3) and 3-keto-4-androsteno[16, 17-c]furoxan (8) from 16-oximinoestrone methyl ether and 16-oximino-5-androsten-3β-ol-17-one, respectively, are described.

ISSN:0008-4042    

DOI:10.1139/v68-014

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

The 2,4,6-tri-O-acetates of methyl 3-deoxy-3-nitro-β-D-glucopyranoside, -galactopyranoside, and-mannopyranoside, the 2-O-acetates of the 4,6-O-benzylidene derivatives of the two first-mentioned glycosides, and the tetra-O-acetate of 1,4-dideoxy-1,4-dinitro-neo-inositol are prepared by boron trifluoride–catalyzed acetylation. The advantages of the procedure over acetylation in pyridine are pointed out. Theglucotriacetate, when produced in the presence of pyridine, is accompanied by crystalline by-products of a novel nature. It suffers undetermined changes by the action of activated alumina, and in dilute aqueous alkali it is instantly converted into an unsaturated nitronate.

ISSN:0008-4042    

DOI:10.1139/v68-015

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

A convenient synthesis ofcis,cis-1,6-cyclodecadiene (3) has been described starting fromcis,cis-1,5-cyclononadiene (1). This two-step sequence involves the synthesis of 1,2,6-cyclodecatriene (2) in one-step followed by chemical reduction with sodium and liquid ammonia.

ISSN:0008-4042    

DOI:10.1139/v68-016

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

Primary and secondary alkyl chlorides have been conveniently prepared by the reaction of tri-n-octylphosphine with carbon tetrachloride solutions of the corresponding alcohols. This rapid, high yield reaction proceeds with inversion of configuration. By using carbon tetrabromide the method has been extended to the synthesis of alkyl bromides.

ISSN:0008-4042    

DOI:10.1139/v68-017

出版商:NRC Research Press    

年代:1968

数据来源: NRC