Steuerung der regioselektivität bei der addition von but-2-enylzink-verbindunger an styrol
作者:Herbert Lehmkuhl、Hans Nehl
DOI:10.1016/s0022-328x(00)89046-4
日期:1981.12
The addition of the butenyl—zinc bond in CH3CHCHCH2ZnX derivatives VI–XII (X n-C4H9, t-C4H9, Ph, cyclohexyl, Cl, OCH3, OPh) to styrene (XIII) affords a mixture of Zn → Cprim and Zn → Csec products. The regioselectivity can be controlled by the inductive effects of the substituents X. The log (Zn → Cprim/Zn → Csec) depends linearly on the polar Taft constants of the substituents X.
Gemischte organozinkverbindungen durch austauschreaktionen von diorganozinkverbindungen
作者:Hans Nehl、Walter R. Scheidt
DOI:10.1016/0022-328x(85)88021-9
日期:1985.7
The exchange of organyl groups between various diorganozinc compounds, R21Zn (R1 = CHMe2 (1), CH2(CH2)2Me (2), CH2C(Me)CH2 (3), CH2CHCHMe (4)) and R22Zn (R2 = Et (5), CH(Me)Et (6), CH2(CH2)3Me (7), CMe3 (8), Menthyl (9), Ph (10), Cyclohexyl (11)), has been followed by mass spectroscopy: molecular ions for the mixed compounds R1R2Zn were observed. The exchange equilibrium constants for 1–5 and 7–11
Regioselective C–H bond functionalizations of acridines using organozinc reagents
作者:Isao Hyodo、Mamoru Tobisu、Naoto Chatani
DOI:10.1039/c1cc16582h
日期:——
Despite the recent advance in CâH bond functionalization chemistry, the CâH bonds in the acridine ring system, which is an important scaffold in medicinal and material science, have met with limited success, due, in part, to the lack of activated CâH bonds adjacent to the ring nitrogen atom. Herein, several protocols that can effect the regioselective arylation and alkylation of acridines at the C-4 and C-9 positions are described.
Bis(alk-4-enyl)zink-verbindungen durch addition von alk-2-enylzink an olefine
作者:Herbert Lehmkuhl、Ingo Döring、Hans Nehl
DOI:10.1016/s0022-328x(00)89045-2
日期:1981.12
The dialk-2-enylzinc compounds I–IV add to ethylene, oct-1-ene and 3,3-dimethylcyclopropene to give the corresponding di-alk-4-enylzinc compounds VI–IX (88–98% yield), XV and XVI (90–94% yield), XVII (7%) and XXIIIa–XXVIa (91–98% yield). Additions to XIII are regioselective with Zn → C(1) while stereoselective cis-addition to XXII is observed.