Organolead chemistry. Part IV. Cleavage reactions of bis(η-cyclopentadienyl)lead(<scp>II</scp>) and the preparation of η-cyclopentadienyl-lead(<scp>II</scp>) halides
作者:A. Kenneth Holliday、Paul H. Makin、Richard J. Puddephatt
DOI:10.1039/dt9760000435
日期:——
Bis(η-cyclopentadienyl)lead(II) reacts with HX to give Pb(η-C5H5)X when X = Cl, Br, I, or MeCO2 and PbX2 when X = ButCO2. RCOCHCOR(R = Me, CF3, or But), and RO (R = Me or But), with iodine and methyl iodide to give Pb (η-C5H5)I, and with acetyl chloride to give Pb(η-C5H5)Cl. The compounds Pb(η-C5H5)X are thought to have polymeric structures with bridging X groups.
双(η环戊二烯基)铅(II)与HX进行反应,得到的Pb(η-C 5 H ^ 5)X时,X =氯,溴,I,或梅科2和PBX 2时X =卜吨CO 2。RCOCHCOR(R = Me中,CF 3,或卜吨)和RO(R = Me或卜吨)中,用碘和甲基碘,得到的Pb(η-C 5 H ^ 5)I,并用乙酰氯,得到铅(η-C 5 H ^ 5)氯。化合物的Pb(η-C 5 H ^ 5)X被认为具有与桥连基团X的聚合物结构。
Heterobi- and Trimetallic Cerium(IV) <i>tert</i>-Butoxides with Mono-, Di-, and Trivalent Metals (<i>M</i> = K(I), Ge(II), Sn(II), Pb(II), Al(III), Fe(III))
tetrahydrofuran) with bi- and trivalent metal alkoxides [M(OtBu)x]n (M = Ge, Sn; x = 2; n = 2; M = Pb, x = 2; n = 3; M = Al, Fe; x = 3; n = 2) resulted in volatile products of the general formula MCe(OtBu)4+x (M = Al (4), Fe (5); x = 3; M = Ge (8), Sn (9), Pb (10); x = 2) in high yields. By dissolving 4 and 5 in pyridine the solvent adducts MCe(OtBu)7(NC5H5) (M = Al (6), Fe (7)) were formed, whereas 8 and 9 reacted
的反应Ç erium甲mmonium Ñ itrate(CAN)与不同量KO的吨卜产生homometallic铈(O吨丁基)4(NC 5 H ^ 5)2(1)和杂金属衍生物KCE 2(O吨卜)10(3)通过X射线衍射和NMR光谱表征。氧代-醇盐簇Ce 3 O(O t Bu)9(2)是从四(铈)叔丁基铈(叔丁醇)在n的溶液中获得的。-庚烷在严格的预防措施下,以避免任何意外水解。原位生成的Ce(O t Bu)4(THF)2(THF =四氢呋喃)与二价和三价金属醇盐[ M(O t Bu)x ] n(M = Ge,Sn; x = 2; n = 2; M = Pb,x = 2; n = 3; M = Al,Fe; x = 3; n = 2)得到通式M Ce(O t Bu)4+的挥发性产物X(M = Al(4),Fe(5); x = 3; M = Ge(8),Sn(9),Pb(10); x = 2)高
Structurally Characterized Lead(II) Alkoxides as Potent Ring-Opening Polymerization Catalysts
alkoxides that have already been structurallycharacterized. The heteroleptic complex 3 is accessed via simple alcoholysis of Pb[N(SiMe3)2]2, and this constitutes a convenient alternative to Sita’s heterocumulene route. Plumbylenes 2, 3, and 5 act as competent (pre)catalysts for the living ring-opening polymerization of lactides. With 2, as little as 50 ppm of metal are required to yield poly(lactide)
作者:Frederic Chaput、Jean-Pierre Boilo、Martine Lejeune、Renee Papiernik、Liliane G. Hubert-Pfalzgraf
DOI:10.1111/j.1151-2916.1989.tb07651.x
日期:1989.8
Lead magnesium niobate, Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub3/ (PMN), was prepared by a sol-geltechniqueusing alkoxide precursors. The hydrolysis-condensation mechanism leads to a translucent gel which is dried under hypercritical conditions to avoid collapse of the porous texture. After drying, the aerogel exhibits a B-deficient pyrochlore structure which progressively inserts magnesium oxide when the
Herein we report the first mononuclear alkoxide complexes of UIV and UV with pyridine as co-ligand and a series of heterobimetallic alkoxides of the actinides AnIV (An=U, Th) and UV with divalent group 14 elements GeII, SnII and PbII.
在此,我们报道了首个以吡啶为共配体的 U IV和 U V的单核醇盐配合物以及一系列锕系元素 An IV (An=U, Th) 和 U V与二价第 14 族元素 Ge II、 Sn的异双金属醇盐配合物II和 Pb II。