摘要:

AbstractThe preparation, some spectral properties and the crystal structure of a compound of composition [Cu2Au(Bu2dtc)6][Hg2Br6]*, are reported. The crystal structure is isomorphous with the tricopper analogue: [Cu3(Bu2dtc)6][Cd2Br6].X‐Ray data for the present compound are: space group Pī; unit cell:a= 12.614(4),b= 13.691(4),c= 12.502(4) Å, α = 96.37(4)°, β = 91.47(4)°, γ = 85.43(4)°, with one formula unit per cell. Atomic parameters were refined to a conventionalR‐value of 0.056 for 1752 independent non‐zero reflections. The structure consists of two ionic units: [Cu2Au(Bu2dtc)6]2+and [Hg2Br6]2–. Thenon‐centriccation is situated at a centrosymmetric position, with disordered Cu(III) and Au(III) attached to a central Cu(II) atom.This central Cu(II) atom has an apically distorted octahedral S‐coordination, with Cu–S distances of 2.33(1), 2.28(1), and 3.20(1) Å. The disordered [Cu(III), Au(III)] positions have five‐fold pyramidal S‐coordination with distances of 2.25(1), 2.26(1), 2.29

ISSN:0165-0513    

DOI:10.1002/recl.19760950702

出版商:WILEY‐VCH Verlag    

年代:1976

数据来源: WILEY

摘要:

AbstractThe preparation of a number of chlorinated derivatives ofmeta‐di‐tert‐butylbenzene from 3,5‐di‐tert‐butylacetanilide and from 3,5‐di‐tert‐butylbenzoic

ISSN:0165-0513    

DOI:10.1002/recl.19760950703

出版商:WILEY‐VCH Verlag    

年代:1976

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19760950704

出版商:WILEY‐VCH Verlag    

年代:1976

数据来源: WILEY

摘要:

AbstractThe regular photocyclisation of α‐(9‐phenanthryl)stilbene (1) to 9‐phenylbenzo[g]chrysene (2) is accompanied by formation of 4,5‐diphenylacephenanthrylene (3). A similar photocyclisation, providing a five‐membered ring, occurs on irradiation of 1‐(9‐phenanthryl)‐1‐phenylethylene (4) which yields a small amount of 5‐phenylacephenanthrylene (5). The structures of3and5were confirmed by comparison of their spectral data with those of acephenanthrylene (10). This was synthesized by photolysis of 1‐(o‐iodobenzylidene)indane (8), followed by dehydrogenation, however,10cannot be obtained by irradiation of 1‐(o‐iodobenzylidene)indene (11). The different photoreactivity

ISSN:0165-0513    

DOI:10.1002/recl.19760950705

出版商:WILEY‐VCH Verlag    

年代:1976

数据来源: WILEY

摘要:

AbstractAs in the previously reported low‐ and high‐temperature photochemical reactions, preferred formation of CH3Br is observed when a gas mixture of the title reactants is exposed to the action of a “cold” electrical discharge (35°C) or to high temperatures (100‐450°C). The influence of the main reaction variables on product composition is discussed. It is suggested that the mechanism of CH3Br‐formation in the discharge reaction is largely analogous to that operative in the thermal and the photochemical processes. A crucial step in these reactions is the primary attack of a chlorine atom on methane. The different continous‐flow processes have approximately been optimized with respect to their CH3Br yield per pass (discharge reaction: 16%; thermal reaction: 62%). In addition, optimum energy yields with respect to CH3Br formation are compared. Of the four methods tested the high‐temperature photochemical reaction displays the most favorable combination of CH3Br yield and energy yield. The discharge method generally combines a high selectivity and energy yield with low conversions per pass, and may be attractive if recycling of reac

ISSN:0165-0513    

DOI:10.1002/recl.19760950706

出版商:WILEY‐VCH Verlag    

年代:1976

数据来源: WILEY

摘要:

AbstractTreatment of alicyclic β‐keto esters with a mixture of hydrogen sulfide and hydrogen chloride gives β‐thioxo esters.In some cases three forms of these products have been characterized a thioketone form, a conjugated enethiol form and a non‐conjugated enethi

ISSN:0165-0513    

DOI:10.1002/recl.19760950707

出版商:WILEY‐VCH Verlag    

年代:1976

数据来源: WILEY

摘要:

AbstractAlicyclic β‐thioxo esters react with Grignard reagents to give S‐addition, C‐addition and reduction reactions.When the starting material has a five‐membered ring rearrangement reactions ta

ISSN:0165-0513    

DOI:10.1002/recl.19760950708

出版商:WILEY‐VCH Verlag    

年代:1976

数据来源: WILEY

摘要:

AbstractAlicyclic β‐thioxo esters react with alkyl halides and ethyl chloroacetate to give S‐alkylated compounds.Thioclaisen rearrangement is observed with allyl bromide, crotyl bromide, and propargyl bro

ISSN:0165-0513    

DOI:10.1002/recl.19760950709

出版商:WILEY‐VCH Verlag    

年代:1976

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19760950710

出版商:WILEY‐VCH Verlag    

年代:1976

数据来源: WILEY

摘要:

AbstractRacemic 1‐(5‐benzyloxy‐4‐methoxy‐2‐methylbenzyl)‐1,2,3,4‐tetrahydro‐6‐methoxyisoquinoline (rac.3) was synthesized (Scheme 1). Resolution with (+)‐ and with (‐)‐6,6′‐dinitrobiphenyl‐2,2′‐dicarboxylic acid yielded (‐)‐ and (+)‐3, respectively. By a Birch reduction, followed byN‐formylation, and by acid‐catalysed cyclization, we obtained in high yield racemic, (‐)‐, and (+)‐N‐formyl‐1‐methylnordihydrothebainone (6), respectively. In two ways, by direct reduction and by deformylation followed by reductive methylation,6could be converted selectively into racemic, and (‐)‐, and (+)‐1‐methyldihydrothebainone (7).Synthetic (‐)‐7was found to be identical with (‐)‐1‐methyldihydrothebainone prepared from natural material. This completes the p

ISSN:0165-0513    

DOI:10.1002/recl.19760950711

出版商:WILEY‐VCH Verlag    

年代:1976

数据来源: WILEY