摘要:

AbstractHalogenation of 3‐ethoxy‐6‐halo‐9β,10α‐androsta‐3,5‐dien‐17β‐ol 17‐acetates with perchloryl fluoride,N‐chlorosuccinimide orN‐bromosuccinimide gives rise to the formation of 6,6‐difluoro‐, 6α‐ and 6β‐chloro‐6‐fluoro‐ and 6α‐ and 6β‐bromo‐6‐fluoro‐9β, 10α‐testosterone 17‐acetates. With perchloryl fluoride, besides fluorination at position 6, introduction of fluorine at position 4 takes place. The dehydrohalogenation of the 6,6‐dihalo compounds is investigated. NMR data indicate that ring B of 6β‐brom

ISSN:0165-0513    

DOI:10.1002/recl.19670860302

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractOxidative coupling by oxygen of ammonia andα,β‐orβ,γ‐unsaturated ketones containing a primary γ‐carbon atom in a homogeneous solution of a copper ammonia methoxide catalyst in methanol leads to the formation ofα,β‐unsaturated γ‐lactams

ISSN:0165-0513    

DOI:10.1002/recl.19670860303

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe syntheses of approximately twenty coordination complexes with the ligand ethanol are reported. A new synthetical method is used to obtain these crystalline hexa‐alcohol solvates. About ten perchlorates and fluoroborates of divalent metal ions are easily prepared by dissolving the corresponding hydrates in ethyl orthoformate. In the solid state, even the nitrates contain hexa‐ethanol coordinated metal ions. The electronic and vibrational spectra, a summary of the proton magnetic resonance spectra and some X‐ray powder patterns are given. The complexes of this very weak ligand are now easily obtainable and will be of great importance because ethanol may be replaced simply by many li

ISSN:0165-0513    

DOI:10.1002/recl.19670860304

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

Abstract4‐Nitroveratrole reacts with methylamine in water on illumination with ultraviolet light (mainly 313 mμ) to yieldN‐methyl‐4‐nitro‐o‐anisidine as the major product. The reaction is zero order; the quantum yield is 0.19. With dimethyl‐amine as a partner analogous photosubstitution occurs but the reaction is complicatedinter aliaby the photosensitivity of the products. A short discussion of some practical and theoretical as

ISSN:0165-0513    

DOI:10.1002/recl.19670860305

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe crystals of P4O6S4are tetragonal with space group\documentclass{article}\pagestyle{empty}\begin{document}$ {\rm I}\bar 4{\rm c}2 $\end{document}. The unit cell with dimensions a = 9.065 and c = 13.55 Å contains four molecules with symmetry\documentclass{article}\pagestyle{empty}\begin{document}$ \bar{4}3 {\rm m} $\end{document}(Td) at positions 000, 00 ½, ½ ½ ½ and ½ ½ 0. The structure was solved by vector analysis and refined by the least‐squares method using CuKαreflexions (eye‐estimated and partly photometered data). The average PO and PS distances are 1.61 and 1.86 Å. The shape of the molecule and the packing are compared with those of ana

ISSN:0165-0513    

DOI:10.1002/recl.19670860306

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractMeasurements of the enthalpies of solution of LiI, NaI, KF, KCl, KBr, KI, RbI and CsI inN‐methylacetamide at 35° with an adiabatic calorimeter are reported.A calculation of the ionic enthalpies of solvation of the alkali metal and halide ions inN‐methylformamide andN‐methylacetamide is given. From the difference in ionic enthalpy of solvation of the fluoride and the potassium ions in water, formamide,N‐methylformamide andN‐methylacetamide, respectively, the quadrupole moments of these solvent molecules have been

ISSN:0165-0513    

DOI:10.1002/recl.19670860307

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractReaction of triethylphosphine with HI, HBr or HCl in ethereal solution yields the solid triethylphosphonium salts Et3PHI, Et3PHBr and Et3PHCl, respectively. Infrared spectroscopy indicates the presence of hydrogen bonds Et3PHX, the strengths of these bonds increasing in the sequence X = I

ISSN:0165-0513    

DOI:10.1002/recl.19670860308

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19670860309

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractCaproyl‐peptide methyl esters are suitable derivatives for mass spectro‐metrical analysis. Comparison of mass spectra of methyl esters of caproylpeptides with mass spectra of trideuteromethyl esters of the same compounds, allows easy detection ofC‐terminal fragments. The spectra of ala‐gly, gly‐ser, val‐tyr‐pro and val‐lys‐val‐ty

ISSN:0165-0513    

DOI:10.1002/recl.19670860310

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe kinetics of the isomerization of the three isomeric toluenesulfonic acids have been studied at 140° in 68.7 and 74.0 wt‐% sulfuric acid.The isomer distribution in the sulfonation of toluene at this temperature and acid concentrations, has also been determined. The equilibrium mixtures contain mainly themeta‐ andpara‐ and only small amounts ofortho‐isomer.The experimentally determined pseudo first‐order isomerization rate constants compare satisfactorily with the rate constants calculated from desulfonation rate constants and sulfonation isomer distribution data. This result is discussed in terms of an intermolecular isomerization

ISSN:0165-0513    

DOI:10.1002/recl.19670860311

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY