ISSN:0165-0513    

DOI:10.1002/recl.19690880102

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19690880103

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19690880104

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractOn theoretical grounds it must be expected, that the electrical charge of protein molecules fluctuates around a mean value. In this paper the determination of the standard deviation of the charge from this; mean value in isoionic protein solutions is described. The standard deviation was measured in two independent ways,viz. from conductivity measurements and from the slope of the hydrogen ion titration curves. The proteins investigated were bovine carboxy‐hemoglobin, bovine methemoglobin, horse heart metmyoglobin and bovine serum albumi

ISSN:0165-0513    

DOI:10.1002/recl.19690880105

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19690880106

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractA study of the infrared and Raman spectra of some vicinal dihalogeno‐ethanes, ‐propanes and ‐butanes with predominant antiperiplanar orientation in the straight chain and branched series, reveals that the two C‐Hal stretching frequencies occur characteristically as a more or less strongly coupled pair: an intense Raman band (νs) and a strong infrared active mode of vibration (νas) at lower frequencey.The C‐Hal frequencies of the gauche conformations are weakly coupled.The position of the bands and the difference Δν = νs− νasare functions of the chemical/geometrical structure in the vicinity of the C‐Hal bonds. Empirical rules are presented by which the C‐Hal frequencies or, in strongly coupled systems, the average frequency ofantias well as ofgaucheforms can be predict

ISSN:0165-0513    

DOI:10.1002/recl.19690880107

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractCarbon‐halogen stretching frequencies of 1‐chloro‐l‐chloromethyl — (1), 1‐bromomethyl‐1‐chloro‐ (2), 1‐bromo‐1‐bromomethyl‐ (3), 1‐chloromethyl‐1‐hydroxy‐ (4), 1‐bromomethyl‐1‐hydroxy‐ (5) and 1‐bromomethyl‐1‐methoxycyclohexane (6) are reported. The frequencies were assigned to specific conformations by comparing the observed values with those predicted from the known “stretching parameters” of the several possible chemical/geometrical arrangements in the vicinity of the C‐Hal bond (P. T, S calssification).The dipole moments of1, 3and5in carbon tetrachloride and benzene were measured to obtain quantitive information on the conformational properties of this class of compounds.The dihalides exist as mixtures ofantiandgaucheconformations (tertiary halogen axial) with theantiform predominating on account of its low

ISSN:0165-0513    

DOI:10.1002/recl.19690880108

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe hydrogenation of some forty aromatic ketones to the corresponding alcohols has been studied in ethanol using carbon‐supported palladium as the catalyst. Zero order kinetics with respect to ketone is observed. For acetophenones electronic substituent effects may be expressed in terms of aHammett‐Yukawarelationship with ρ = 0.7. 2‐Alkylacetophenones react very slowly. With alkyl phenyl ketones increase of size of the alkyl group causes increasing rate of hydrogenation. The adsorbed state is discussed on the basis of competition exper

ISSN:0165-0513    

DOI:10.1002/recl.19690880109

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe addition of acrolein to norcamphene leads to anexo‐oxa spiro compound (Scheme 1, VIa). The correspondingendo‐isomer VIb can be obtained from norbornanone X and methoxybutenyne XIIIviathe sequence of reactions outlined in Scheme 2. Because the steric course in some crucial steps is known, theendostructure of VIb can be established.An alternative route leading to theexo‐oxa. spiro compound IXa, starting with norbornanone is given in Scheme 3. Another route to predominantlyendo‐oxa compounds from norbornanone is given in S

ISSN:0165-0513    

DOI:10.1002/recl.19690880110

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractDimethyl‐ and dibutyl‐ethynylphosphine oxide R2P(O)C ≡ CH with R = CH3andn‐C4M9, respectively, have been prepared from the corresponding dialkylphosphinic chlorides.Reactions of (C2H5)2NH, (CH3)2NH2, NaOCH3, NaOC2H5, NaSC2H5, HCl and HI with these ethynylphosphine oxides afforded 1: 1 adducts of the general formula R2P(O)CH = CHY. With the exception of alkoxide the addition occurred in thetransfashion yielding theciscompounds, but several adducts thermally rearranged to thetransisomers.As a side reaction with Na OC2H5, nucleophilic substitution at the phosphorus atom was observed.The stereochemistry of the reactions was established by NMR spectroscopy. The influence of substituents on coupling constants was

ISSN:0165-0513    

DOI:10.1002/recl.19690880111

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY