摘要:

AbstractA comparative study of some isocyanide dichlorides R‐NCCl2and their isomericN‐chloro‐formimidoyl chlorides R‐C(Cl) NCl is described. For this purpose we tried to synthesizeN‐cyano‐isocyanide dichloride (III) and diisocyano tetrachloride (tetrachloroformalazine) (IX). Chlorination of S,S′‐dimethyl cyanodithiocarbonimidate (II) did not yield III but the dimeric 2,4‐dichloro‐6‐dichloromethylimino‐s‐triazine (IV) (tetramer of cyanogen chloride). IX was prepared by exhaustive chlorination of te

ISSN:0165-0513    

DOI:10.1002/recl.19710900502

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractDiallyl oxalate (DAO) vapour‐in an excess of toluene at atmospheric pressure and at 380‐510° ‐decomposes initially, homogeneously and in a first order process, giving carbon dioxide and allyl radicals; its half life is 20 minutes at 400°. DAO is thus found to be much more stable than was inferred from recent low temperature work byJamesandKambanis5. It is concluded that the latter decomposition, in contrast with that in our hands, occurs at the wall of the reactor.Apart from dimerizing, allyl radicals abstract hydrogen from toluene; the rate constant for this metathesis has been calculated and compared with literature data. Finally it is outlined that metathetical reactions R· + R′H → RH + R′·, involving allylic or benzylic groups R, R′ will proceed with activation energies of well below 20 and presumably of abou

ISSN:0165-0513    

DOI:10.1002/recl.19710900503

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractA number of new solvates and adducts containing hexamethylphosphoramide is reported. The solvates have the general formula M{[(CH3)2N]3PO}42+(anion)22−, in which M = Mg, Ca, Sr, Mn, Fe, Co, Ni, Zn and Cd and the anions are BF4−, ClO4−and B(C6H5)4−. The adducts have the general formula M(anion)n{[(CH3)2N]3PO}m, in which M = Mg, Ca, Sr, Ba, Mn, Fe, Co, Ni, Cu, Zn, Cd, Al, Cr, Fe, Mo, n = 1 − 3, m = 1/2 − 5 and the anions are Cl−, Br−, I−, NO3−, NCS−, CH3COO−and SO42−.The compounds are characterized and identified by chemical analysis and physical measurements.Infrared spectra in the region 4000‐200 cm−1have been investigated. The shift towards lower wave numbers in the P‐O stretching frequency and towards higher wave numbers in the P‐O bending frequency of the complexes is discussed. It is concluded, as has been suggested by other workers, that coordination takes placeviathe oxygen atom. A tentative assignment for the other ligand bands is proposed.Ligand‐field spectra for the complexes of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Cr(III) and Mo(III) have been investigated. Adapted values for Dq and B are reported and the ligand is placed in the spectrochemical and nephelauxetic series.In agreement with results obtained by other workers it is concluded that if the anions are present as uncoordinated ions, or participate in the coordination as monodentate ligands, hexamethylphosphoramide has a tendency to form tetrahedrally surrounded complexes. With potential polydentate anions octahedrally

ISSN:0165-0513    

DOI:10.1002/recl.19710900504

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractCrystals ofN,N‐dimethyl‐p‐bromocinnamamide are triclinic of space group P1p̄, Z = 2, cell constantsa= 7.686,b= 12.325,c= 5.850 Å, α = 83.98, β = 81.27 and γ = 94.23°.The plane of the CO‐N(CH3)2‐group is rotated 15° out of thes‐cisconformation with respect to the rest of the

ISSN:0165-0513    

DOI:10.1002/recl.19710900505

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19710900506

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractThe oxidation of adamantane by fuming sulfuric acid to 1,3‐, 1,4‐, and 2,6‐dihydroxyadamantane is discussed. The reactions are considered as hydride transfers from the adamantane nucleus to the acid. A synthetic procedure for 2,6‐adamantanedione and 5‐hydroxy‐2‐adamantanone

ISSN:0165-0513    

DOI:10.1002/recl.19710900507

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractThe Raman and infrared spectra of solid TeCl4and SeCl4are presented. On the basis of an ionic formulation (MCl3+and Cl−ions) an assignment of the stretching frequencies of the MCl3+‐ion (with nearly C3vsymmetry) is given. The results of a recently published X‐ray analysis of solid TeCl4made this assignment more detailed. Only suggestions could be made as to the assignment of the bending frequencies of the ca

ISSN:0165-0513    

DOI:10.1002/recl.19710900508

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19710900509

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19710900510

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

Abstract3β‐Acetoxy‐14β‐androst‐5‐en‐17‐one (7b) has been prepared in five steps from its 14α‐isomer 1. The influence of water on the chromic anhydride oxidation of 3β‐acetoxy‐5α,6β‐dichloroandrostan‐17‐one (2) in acetic acid has been investigated. The yield of 14α‐hydroxy‐derivative 3 is maximal if 2 to 3% of wate

ISSN:0165-0513    

DOI:10.1002/recl.19710900511

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY