Some metallabicyclo-octadienes and -nonadienes of dicyclopentadienyltitanium, - zirconium and -hafnium
作者:Shahid M. Yousaf、Michael F. Farona、Raymond J. Shively、Wiley J. Youngs
DOI:10.1016/0022-328x(89)87115-3
日期:1989.3
Titanocene, zirconocene, and hafnocene dichlorides were reduced in the presence of terminally disubstituted 1,6-heptadiyne or 1,7-octadiyne to produce dicyclopentadienylmetallabicyclooctadienes and -nonadienes. The compounds were characterized by elemental analysis and 1H and 13C NMR spectrometry, and (C5H5)2HfC7H6[Si(CH3)3]2 was characterized by X-ray diffraction techniques. The compounds crystallized
在末端双取代的1,6-庚二炔或1,7-辛二炔的存在下还原钛茂,二茂锆和no茂二氯化物,生成二环戊二烯基金属戊环辛二烯和-壬二烯。通过元素分析和1 H和13 C NMR光谱对化合物进行表征,并通过X射线衍射技术对(C 5 H 5)2 HfC 7 H 6 [Si(CH 3)3 ] 2进行表征。在尺寸为a 10.214(2),b 12.213(2),c的晶胞中的三斜晶空间群P中结晶的化合物10.051(3)A,α79.53(2),β105.25(2),γ96.26(2)°,V 1187.2(5)3。细化做的目的是最终协议为3950个反射与˚F 0 2 3σ(˚F 0 2的)- [R (˚F)= 0.042
The cobalt way to vitamin B6
作者:Carol A. Parnell、K. Peter、C. Vollhardt
DOI:10.1016/s0040-4020(01)91418-8
日期:1985.1
Cocyclization of bis(trimethylsilyl)- and bis(trimethylstannyl)di-2-propynyl ether with acetonitrile provides a synthetic entry into 1,3-dihydro-6-methyl-4,7-bis(trimethylsilyl)- and bis(trimethylstannyl)-furo[3,4-c]pyridines. Regioselective electrophilic substitution of the respective silyl or stannyl groups allows for a regiocontrolled construction of tetrasubstituted pyridines. This method has been
双(三甲基甲硅烷基)-和双(三甲基锡烷基)二-2-丙炔基醚与乙腈的共环化可合成1,3-二氢-6-甲基-4,7-双(三甲基甲硅烷基)-和双(三甲基锡烷基)-呋喃[3,4- c ]吡啶。各自的甲硅烷基或苯乙烯基的区域选择性亲电子取代允许区域控制的四取代吡啶的构建。该方法已应用于维生素B 6的全合成。
Coming Back to the Starting Position of Carbons Traveling in Organic Molecules on Titanium: Merry-Go-Round Reaction
Traveling of carbonatoms in organic molecules was successfully achieved. The six-membered ring of dihydroindenyl moiety on titanium rotated based on the five-membered ring like a merry-go-round. Two carbons at the bridgehead of the dihydroindenyl moiety and the other three carbons of the five-membered ring were monitored by 13C-labeled experiments. The two carbons at the bridgehead moved to the farthest
Cobalt-mediated regio- and stereoselective assembly of dienamides by hydroaminative alkyne coupling of α,ω-diynes
作者:Vincent Gandon、Corinne Aubert、Max Malacria、K. Peter C. Vollhardt
DOI:10.1039/b716841a
日期:——
In the presence of CpCo(C(2)H(4))(2), alpha,omega-diynes undergo hydroaminative coupling with amides to furnish new dienamides with control of regio- and stereochemistry.