摘要:

AbstractThe rate constants for the hydrolysis of the bisulfite addition compounds of cyclohexanone, 4‐tert‐butylcyclohexanone and their α‐deuterated homologues have been measured.There is a large difference between the isotope effects observed for the cyclohexanone (kH/kD= 1.10) and the “slow” isomer from the 4‐tert‐butylcyclohexanone (‐ SO3−equatorial;kH/kD= 1.05). This result is discussed in terms of the existing difference between the geometries of the transition states.The conformational energy of the ‐ SO3−group has been determined and found to be e

ISSN:0165-0513    

DOI:10.1002/recl.19690880202

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThermal addition of acrolein to β‐pinene leads mainly to the unsaturated aldehyde I and, in small amount, to the spiro compound II. Heating of I with dilute acid yields 6‐isopropyltetralin (IV) and the tricyclic diol V, the latter being favoured at very low acid concentrations. Oxidation of this diol yields the ketol VI with a negative Cotton‐effect and the diketone VII with a positive Cotton‐effect, both in accordance with the suggested stereo

ISSN:0165-0513    

DOI:10.1002/recl.19690880203

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

Abstractβ‐Tetralone (Ia) and 6‐methoxy‐β‐tetralone (Ib) have been alkylatedviathe corresponding pyrrolidine enamines to their 1‐alkoxycarbonylmethyl derivatives IIIa and IIIb. Reaction of IIIa and IIIb with hydrazine hydrate gave benzo[f]cinnolones IVa and IVb, which were reduced with lithium aluminium hydride to tricyclic hydrazines VIa and VIc, respectively. Treatment of the latter with malonyl dichloride and triethylamine led to the formation of 13,14‐diazasteroids IXa and IXb. Condensation of IIIb with hexahydropyridazine (XIII) gave the D‐homo‐diazasteroidal syste

ISSN:0165-0513    

DOI:10.1002/recl.19690880204

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19690880205

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe heat of combustion of benzoic acid NBS standard sample 39i supplied by the National Bureau of Standards (Washington) was measured. The mean value under standard bomb conditions was found to be:26431.9 ± 1.6 J per gram.Measures leading to a high precision are given. Systematic errors were studied

ISSN:0165-0513    

DOI:10.1002/recl.19690880206

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

Abstract4,7‐Decadienal, 4,7‐tridecadienal, 5,8‐tetradecadienal and 6,9‐dodecadienal (all‐cis) have been synthesized by coupling 1‐bromo‐2‐pentyne and 1‐bromo‐2‐octyne with the diethyl acetals of 4‐pentynal, 5‐hexynal and 6‐heptynal, followed by partial hydrogenation and hydrolysis. The formation of 1,1,4‐triethoxy‐2,5‐hexadiyne from 1,1‐d

ISSN:0165-0513    

DOI:10.1002/recl.19690880207

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe molecular structure of bicyclo[3.1.1]heptane has been investigated by means of electron diffraction of the vapour. The molecule has one plane of symmetry and an average carbon‐carbon bond length of 1.537 Å. Details of the structure are compared with those in similar molecules and differences between the carbon‐carbon bond lengths are discussed with reference to semi‐empirical predictions based on the results of MO calcul

ISSN:0165-0513    

DOI:10.1002/recl.19690880208

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19690880209

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractDialkoxymethyl acetates and 2‐acetoxy‐1,3‐dioxolanes have been prepared from orthoformates and a “formic acid/acetic anhydride reaction system”. The rǒle of the “reaction system” is discussed. Other methods of synthesis of these acetates and other carboxylates are

ISSN:0165-0513    

DOI:10.1002/recl.19690880210

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractA hitherto unknown transformation of alkyl‐(aryl)‐imidazoles into alkyl‐(aryl)‐1,2,4‐oxadiazoles is

ISSN:0165-0513    

DOI:10.1002/recl.19690880211

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY