ISSN:0009-4536    

DOI:10.1002/jccs.196900001

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe extended Huckel theory suggesteted by Hoffmann can be further simplified by neglecting the differential overlap integrals. The results agree fair well with the SCF‐MO theory in the cases of B2, C2, N2, O2, and F

ISSN:0009-4536    

DOI:10.1002/jccs.196900002

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe isomerization of vibrationally excited methylcyclopropane and thetrans‐ tocis‐2‐butene ratio were studied as a function of pressure at room temperature. The ratio is larger than unity at low pressures and within experimental error is about constant and close to unity at high pres

ISSN:0009-4536    

DOI:10.1002/jccs.196900003

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe crystal structure of bis‐cyclopentadienyl beryllium has been investigated by analysis of three‐dimensional X‐ray diffraction data both at room temperature (RT) and at 120°C(LT). For data collection, Cu K∞radiation and equal‐inclination, multiple‐film Weissenberg technique were used. Data collected were 0–3 alonga, and 0–3 alongbfor RT, and 0–2 alongaand 0–2 alongbfor LT.Cryst

ISSN:0009-4536    

DOI:10.1002/jccs.196900004

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractSeven new 4‐chlorobutoxysilanes were synthesized and the trends of effect of phenyl‐ and methyl‐group on the yield and refractive index were obs

ISSN:0009-4536    

DOI:10.1002/jccs.196900005

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

ISSN:0009-4536    

DOI:10.1002/jccs.196900006

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractUpon treatment with three equivalents of methyllithium in ether at room temperatureexo‐3‐d‐norcamphor tosylhydrazone gave norbornene which retained 21% of the deuterium andexo‐3‐d‐apocamphor tosylhydrazone gave apobornylene which retained 50% of the deuterium based on nmr and mass spectral analysis. In both casesexo‐elimination is favored when the primary isotope effect is considered. The relatively low selectivity betweenexo‐andendo‐elimination as compared with that observed in solvolytic studies was tentatively rationalized by the carbarion character of the transition state leading to proton abstra

ISSN:0009-4536    

DOI:10.1002/jccs.196900007

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe polymerization of methyl methacrylate with Ni (II) benzoyl trifluoroacetonate was investigated. The rate of polymerization was proportional to the square root of the initiator concentration and 1.5 power of the monomer concentration. The activation energy for the overall polymerization was 13.4Kcal/mole, which yields 17.6Kcal/molefor the activation energy and 9.58 × 105sec−1for the collision frequency factor for the initiati

ISSN:0009-4536    

DOI:10.1002/jccs.196900008

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe kinetics of photosensitized polymerization of methyl methacrylate with benzoin was investigated. The rate of polymerization was proportional to the square root of the concentration of benzoin and the first power of the monomer. The equationRp=K1([M]‐α1) ([B]0.5+α2) was proposed, andK1α1and α2were evaluated as 0.999×10−4, 0.181 and 1.11×10−2, respectively. The rate of polymerization was also proportional to the square root of light intensity in accordance with the equationRp=5.65×10−12I0.5. Carbon tetrachloride and chloroform markedly decreased the average degree of polymerization. The chain transfer coefficients were evaluated as 2.44 × 10−3and 1.90 × 10−3for carbon tetrachloride and chl

ISSN:0009-4536    

DOI:10.1002/jccs.196900009

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY