摘要:

Substituent group distribution in allyl cellulose, resulting from the base-catalyzed condensation of sodium allyl sulfate with cotton cellulose and having a degree of substitution of 0.07, was found to be 0.7:0.2:1.0 in the 2-O-, 3-O-, and 6-O-positions of the anhydroglucose units. Several new glucose derivatives were prepared in the syntheses of the 2-O-, 3-O-, and 6-O-allyl-D-glucoses.

ISSN:0008-4042    

DOI:10.1139/v68-113

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

The preparation ofL-lactyl-L-valine fromL-lactic acid andL-valine, by methods used for the synthesis of peptides, was investigated. Initial experiments withO-benzoyl-DL-lactic acid andDL-valine benzyl ester unexpectedly gaveN-benzoyl-DL-valine benzyl ester. However, coupling betweenO-benzyloxycarbonyl-DL-lactic acid and eitherDL-valine, orDL-valine benzyl ester, occurred in good yield. A simpler method, which was reported to give a 39% yield ofL-lactyl-L-valine, gave only 10% of product but was modified to giveL-lactyl-L-valine-1-14C in 90% yield.

ISSN:0008-4042    

DOI:10.1139/v68-114

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

The major components of the leaf oil of the Ashe juniper were found to bed-camphor (42.1 %),d-bornyl acetate (22.5%),d-limonene (8.4%), tricyclene (4.8%),d-camphene (4.4%),d-borneol (2.9%),p-cymene (2.8%),d-α-myrcene (1.8%),d-α-pinene (1.7%), andd-camphene hydrate (1.5%). This appears to be the first time that the latter alcohol has been isolated from a natural source. Smaller amounts of linalool, carvone, elemol, and traces oftrans-2-methyl-6-methylene-3,7-octadien-2-ol were also identified. Several alcohols having terminal methylene groups were isolated in trace amounts.The monoterpenes found in this oil are not typical for the genusJuniperusand this result offers a unique chemical approach to the study of introgression of the Ashe juniper with other juniper species.

ISSN:0008-4042    

DOI:10.1139/v68-115

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

Reactions between hydrazine orN,N-dimethylhydrazine and (CF3)2PI, (CF3)2PCl, (CF3)3P, and (CF3)2PNMe2have been further investigated as synthetic routes to phosphinohydrazine compounds. The new compoundN,N-dimethyl,N′-bis(trifluoromethyl)phosphinohydrazine (m.p. 40.45°, b.p. 112° extrapolated) is described, and instability of [(CF3)2P]xN2H4−xsystems with respect to elimination of fluoroform is inferred.

ISSN:0008-4042    

DOI:10.1139/v68-116

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

2-Hydroxythiazolo[4,5-c]isoquinoline (1) and 2-hydroxythiazolo[5,4-c]isoquinoline (2) were both found to exist predominantly in the lactam form (1band2brespectively) from infrared, nuclear magnetic resonance, and ultraviolet spectral evidence. Various methylating agents methylated compound1exclusively on the N-3 atom in the thiazole ring. Compound2on the other hand, gave a mixture of O-and N-3 methylated products with diazomethane and a mixture of N-1 and N-4 methylated products with either methyl iodide or dimethyl sulfate.

ISSN:0008-4042    

DOI:10.1139/v68-117

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

Preliminary studies on an alternative polypyrone route to protected β-polyketo acid chains are reported. The synthesis of the basic pyrone units involved and their conversion to C-3 acylated compounds are described.

ISSN:0008-4042    

DOI:10.1139/v68-118

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

Carbodihydrazones and oxalyl dihydrazones have been prepared using the reaction between aldehydes and carbohydrazide and oxalyl dihydrazide, respectively. The structures of these new series of compounds have been established by comparing their infrared absorption spectra with those of related compounds.The potential scope of the synthetic method has been indicated by the preparation of analogous derivatives from two aromatic aldehydes and from two simple ketones.

ISSN:0008-4042    

DOI:10.1139/v68-119

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

2-Methoxy- and 2-t-butoxy-5,6-dihydro-2H-pyran react withm-chloroperoxybenzoic acid to give mixtures oftrans- andcis-2-alkoxy-3,4-epoxytetrahydropyrans in which thetranstocisratio is 3:1 and 9:1 for the 2-methoxy and 2-t-butoxy homologues respectively. This selectivity is attributed to the steric effect of the 2-alkoxy group.Lithium aluminium hydride attacks the ring in thesecisandtranscompounds exclusively at the epoxide carbon remote from the alkoxy substituent to form only 2-alkoxy-3-hydroxytetrahydropyrans. This selectivity of hydride attack is attributed to the polar influence of the two geminal oxygen atoms. Steric factors in this hydride reduction are apparently completely submerged by this polar effect.

ISSN:0008-4042    

DOI:10.1139/v68-120

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

The syntheses of 1-methyl-, 1,1-dimethyl-,cis(?)-1,2-dimethyl-, 1,1,2-trimethyl-, and 1,1,2,2-tetramethylacenaphthene have been accomplished by standard reactions from the two compounds 1-acenaphthenone and 2-methyl-1-acenaphthenone. These two ketones were in turn obtained from 1-naphthaleneacetic acid.

ISSN:0008-4042    

DOI:10.1139/v68-121

出版商:NRC Research Press    

年代:1968

数据来源: NRC

摘要:

A reinvestigation of the structure of ranunculin, the glucosidic precursor of the vesicant principle of manyRanunculusspecies, protoanemonin, supported the gross structure proposed by Hill and van Heyningen and led to the stereochemistry at the asymmetric center of the aglucone.

ISSN:0008-4042    

DOI:10.1139/v68-122

出版商:NRC Research Press    

年代:1968

数据来源: NRC