摘要:

AbstractAutoxidative processes in HCl may be influenced by reactions of the organic peroxy intermediates, or of H2O2, with the medium. These reactions with HCl led to the evolution of O2and also of Cl2under certain conditions. The question whether HCl is oxidized by an organic peroxy intermediate or by H2O2could be answered.Organic compounds may be chlorinated by H2O2‐HCl in high yields. The experiments strongly support the idea that aromatic chlorination is then effected by the species HOCl and/or HOOCl which are producedin sit

ISSN:0165-0513    

DOI:10.1002/recl.19720910602

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractComplex‐formation between the ligand nonamethylimidodiphosphoramide (NIPA) and nickel(II) iodide has been investigated.By varying the solvent and the metal salt to ligand ratio, three compounds could be isolated, that were identified by chemical analysis and physical measurements as [Ni(NIPA)3]2+[I−]2; [Ni(NIPA)2I2] and [Ni(NIPA)3]2+[NiI4]2−.The compound [Ni(NIPA)2I2] appeared to be unstable in the solid state; its decomposition was studied and a possible mechanism is

ISSN:0165-0513    

DOI:10.1002/recl.19720910603

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractA new synthesis for 5,7‐dichloroimidazo[4,5‐b]pyridine is described. From this compound and 5‐amino‐7‐chloroimidazo[4,5‐b]pyridine a number of 5,7‐disubstituted imidazo[4,5‐b]pyridines are prepared, including 7‐aminoimidazo[4,5‐b]pyridin‐5‐one, the 1‐dea

ISSN:0165-0513    

DOI:10.1002/recl.19720910604

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe kinetics of the isomerization of 1,1‐cyclopropanedicarboxylic acid1ato αcarboxy‐γ‐butyrolactone3ain D2O and in aqueous D2SO4(up to 56%) has been studied at temperatures up to 160°C.The pseudo first‐order reaction is progressively accelerated by increasing sulfuric acid concentrations and according to Bunnett's w, w* and ψ‐values, the rate‐limiting step is probably the nucleophilic attack of water on a cyclopropyl ring carbon atom of the protonated substrate.2‐Methyl‐1,1‐cyclopropanedicarboxylic acid1band 2,2‐dimethyl‐ 1,1‐cyclopropanedicarboxylic acid1cisomerize faster than1aby a factor of 31 and 80,000 respectively. The tremendous, rate‐enhancement of1ccan be explained by a rate‐limiting dissociation of a ring carbon‐carbon bond of the pr

ISSN:0165-0513    

DOI:10.1002/recl.19720910605

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19720910606

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractA set of force constants for dimethyl sulfide and deuterated analogues CH3SCD3and (CD3)2S has been calculated using a modified general valence force field. The calculated force constants reproduce the fundamental frequencies observed fairly well.

ISSN:0165-0513    

DOI:10.1002/recl.19720910607

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19720910608

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractNematocidal activity of 1,2‐di(2‐thienyl)ethenes involves electron acceptance by these molecu

ISSN:0165-0513    

DOI:10.1002/recl.19720910609

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractCrystals of β‐chloroglutaric anhydride are monoclinic. The space group is C2/c, the unit cell constants are a = 23.63, b = 6.07, c = 20.83 Å, β = 122.1° and Z = 16. Three‐dimensional photographic X‐ray diffraction data were collected at room temperature. The structure was solved with a minimum function and refined using the least‐squares method.The six‐membered ring has a sofa conformation, the β carbon atom being 0.63 Å out of the plane of the other ring atoms. The—CO‐O‐CO moiety is coplanar with the ring atoms, the CCl bond has axial orientation. A slight difference in conformation between the two crystallographically independen

ISSN:0165-0513    

DOI:10.1002/recl.19720910610

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractReaction of 1,3‐dialkoxy‐1‐alkynes R2R3C(OR1)C  COR (I) (R and R1are alkyl, R2and R3are H or alkyl) with organolithium compounds R4Li affords a mixture of 1‐substituted allenyl ethers R2R3C  C  C(R4)OR (II) (major product) and 2‐alkynyl ethers of the type R2R3C(OR1)C  CR4(III). The formation of 2‐alkynyl ethers was not observed when R2 R3 H.The ratios allenyl ether/2‐alkynyl ether depend on R4Li, the leaving groups OR1and OR, and the solvent.For preparative conversions to allenyl ethers a 1:1 mixture of ether and 1,2‐dimethoxyethane is suitable as solvent.By acid catalyzed isomerization the 1‐alkylated allenyl ethers II are converted smoothly and quantitatively into conjugated alkoxydienes (IV), especi

ISSN:0165-0513    

DOI:10.1002/recl.19720910611

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY