ISSN:0165-0513    

DOI:10.1002/recl.19831020401

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractIntroduction of a methyl group at C(9) of the fluorenyl anion changes the chemical shifts of the protons at C(2) and C(3) in opposing senses.

ISSN:0165-0513    

DOI:10.1002/recl.19831020402

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractThetrans‐tert‐butylation reaction by 2,6‐di‐tert‐butyl‐4‐methylphenol has been studied for a number of phenols in the presence of different catalysts. Equilibria, as well as reaction kinetics, have been investigated. The mechanism involves the intermediacy of atert‐butyl ether. This mechanism is supported both by the kinetics and the initially highortho/pararatio as well as by the reversed sub

ISSN:0165-0513    

DOI:10.1002/recl.19831020403

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractThe mono‐ and di‐sulfonation of pyrene (1a), 1‐methylpyrene (1b) and perylene (2), with SO3in nitromethane at 0°C, has been studied. The monosulfonation of1a, 1band2leads to the almost exclusive formation of the 1‐, the 6‐ + 8‐ and the 3‐sulfonic acid, respectively, which is in agreement with predictions based on the calculated localization energies for the various positions of the respective arenes. The sulfonation of pyrene‐1‐sulfonic acid yields the 1,3‐disulfonic acid as the main product while that of both 1‐methylpyrene‐6‐ and ‐8‐sulfonic acid mainly yields the 6,8‐disulfonic acid. Perylene‐3‐sulfonic acid yields almost exclusively the 3,9‐ and/or the 3,10‐disulfonic acid. The positional reactivity orders of the pyrenesulfonic acids are determined by the (electronic) directing effect of the sulfonic acid substituent, while that of perylene‐3‐sulfonic acid is determined by t

ISSN:0165-0513    

DOI:10.1002/recl.19831020404

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractVariable temperature13C and1H NMR studies have revealed the equatorial‐apical preference of dioxaphosphorinane rings in pentacoordinated trigonal bipyramidal spirophosphorane

ISSN:0165-0513    

DOI:10.1002/recl.19831020405

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

Abstract6H‐Benzo[cd]pyren‐6‐one (6), a potentially carcinogenic constituent of carbon black, can be synthesized smoothly and in good overall yield (49%) from pyrene (1), by using the reactivity of the pyrene di

ISSN:0165-0513    

DOI:10.1002/recl.19831020406

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractUpon irradiation, pyrene reacts with cyanide to give 1‐cyanopyrene and with amide to give 1‐aminopyrene. With oxygen nucleophiles no reaction takes place. Irradiation of pyrene in the presence of diethyl malonate anion yields 4,5,9,10‐tetrahydropyrene in high yield, probably via initial electron transfer to excited pyrene. 1‐Fluoropyrene can be photosubstituted with oxygen nucleophiles, leading to 1‐hydroxy‐ and 1‐methoxy‐pyrene, in contrast to 1‐chloro‐ and 1‐bromopyrene, which are converted into a mixture of pyrene and 4,5‐dihydro

ISSN:0165-0513    

DOI:10.1002/recl.19831020407

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractReaction of the pyrene dianion with 1,4‐diiodobutane affordedcis‐8b,9,10,11,12,12a‐hexahydrobenzo[e]pyrene, which could subsequently be oxidized by DDQ to give benzo[e]‐pyrene. Thus, benzo[e]pyrene was formed from pyrene in an overall yield

ISSN:0165-0513    

DOI:10.1002/recl.19831020408

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractUsing13C NMR spectroscopy, the pyrene dianion has been shown to be a completely asymmetric system having the highest charge density on the carbon atom at the 4‐position. This result, which is in contrast to that obtained previously on the basis of theoretical calculations, confirms our earlier observations that the pyrene dianion reactivity towards electrophiles is highest at the 4‐posit

ISSN:0165-0513    

DOI:10.1002/recl.19831020409

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractThe conversion of 1‐halogeno‐2,7‐naphthyridines into the corresponding 1‐amino compounds with KNH2/NH3, is shown, by the use of deuterated starting compounds, to proceed via an SN(AE)ipsosubstitution andnotvia an SN(AE)telemechanism, even though convincing evidence for the formation ofteleσ‐adduct, 8‐amino‐1‐halogeno‐dihydro‐2,7‐naphthyridinide, was obtained. Using the same methods, it is shown that the conversion of 2‐bromo‐1,8‐naphthyridine into 2‐amino‐1,8‐naphthyridine proceeds, to the extent of

ISSN:0165-0513    

DOI:10.1002/recl.19831020410

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY