• 作者： 洪豐裕 ; 張元騰 ; 陳繼添
• 作者服務機構： 中興大學化學系
• 中文摘要： The reaction of (.eta./sup 5/-cyclopentadienyl)(.eta./sup 4/-1,3-diphenylcyclobutadiene)cobalt (I) with excess Cr(CO)/sub 3/py/sub 3/ in BF/sub 3/-OEt/sub 2/ yielded two identified heterometallic compounds. Compounds(II) and (III) with one and two phenyl rings complexed with Cr(CO)/sub 3/ fragment(s), respectively. These compounds were characterized by mass, infrared, /sup 1/H and /sup 13/ C NMR spectra and elemental analysis. The crystal structure of (II) was determined. The Cr(CO)/sub 3/ fragment bends inward toward the cyclobutadiene ring due to its electron- withdrawing ability, in accord with Hunter's postulate. A sharp line due to the non-complexed phenyl ring was observed in the /sup 1/H NMR spectrum, which implies that five protons are magnetically equivalent. The chemical shifts of two protons of the cyclobutadiene ring decreased from (I) to (II) then to (III), possibly because of diminished deshielding effect from the phenyl ring in(arene)Cr(CO)/sub 3/.
• 英文摘要： --
• 中文關鍵字： Chromium Complex; Cyclobutadiene; Electron Withdrawing; Deshielding
• 英文關鍵字： 鉻錯合物；環丁二烯；拉電子；去遮蔽