Borane , iron complex

ALKYLALUMINIUM DERIVATIVES, ALKYLBORANES, ALKYLHALOBORANES ALKYLHALOPHOSPHINES, ALKYLHALOSILANES, ALKYLMETALS ALKYLNON-METAL HYDRIDES, ALKYLPHOSPHINES, ALKYLSILANES ARYLMETALS, BORANES, CARBONYLMETALS, COMPLEX ACETYLIDES COMPLEX HYDRIDES, HALOACETYLENE DERIVATIVES HEXAMETHYLNITRATODIALUMINATE SALTS, METAL HYDRIDES NON-METAL HYDRIDES, ORGANOMETALLICS, PYROPHORIC ALLOYS PYROPHORIC CATALYSTS, PYROPHORIC IRON-SULFUR COMPOUNDS PYROPHORIC METALS... 

Methylcryptaustoline iodide (14) was synthesized from phenylacetic acid 47 by Elliott (39) as shown in Scheme 7. Nitration of 47 to the 6-nitro compound 48 and reduction with sodium borohydride afforded lactone 49. Reduction of the aromatic nitro group with iron powder in acetic acid gave ami-nolactone 50, which was converted to tetracyclic lactam 51 with trifluoroacetic acid in dichloromethane. Reduction of the lactam by a borane-THF complex followed by treatment with methyl iodide afforded ( )-0-methylcryptaustoline iodide (14). 

Bis(phosphoranimine) ligands, chromium complexes, 5, 359 Bis(pinacolato)diboranes activated alkene additions, 10, 731—732 for alkyl group functionalization, 10, 110 alkyne additions, 10, 728 allene additions, 10, 730 carbenoid additions, 10, 733 diazoalkane additions, 10, 733 imine additions, 10, 733 methylenecyclopropane additions, 10, 733 Bisporphyrins, in organometallic synthesis, 1, 71 Bis(pyrazol-l-yl)borane acetyl complexes, with iron, 6, 88 Bis(pyrazolyl)borates, in platinum(II) complexes, 8, 503 Bispyrazolyl-methane rhodium complex, preparation, 7, 185 Bis(pyrazolyl)methanes, in platinum(II) complexes, 8, 503 Bis(3-pyrazolyl)nickel complexes, preparation, 8, 80-81 Bis(2-pyridyl)amines... 

NSiQHn, tert-Butylamine, iV-(trimethyl-silyl)-, 25 8 N2, Dinitrogen iron complexes, 24 208, 210 osmium complex, 24 270 N2BC4H, Borane, cyano-compd. with trimethylamine (1 1),... 

Examples of iron rj -B=C complexes of a boraalkene are known as well. The Fe(CO)4 complex of 9-fluorenylidene(tetramethylpiperidino)borane (126) has recently been prepared by the thermal reaction of the borane and (2) or by the photolytic reaction of (1) and the borane. The monophosphine/phosphite complexes are prepared from the tetracarbonyl by photolytic CO dissociation, followed by PRb addition. ... 

In a search for a suitable catalyst we started with lanthanide iodides, monitoring by 1 B NMR analysis the stability of 1 M catecholborane solutions in tetrahydrofliran containing 10 molar % of SmL, f-BuOSmL, and Lat. Unfortunately, in the presence of these iodides a signal corresponding to borane-tetrahydrofiiran, and other signals, appeared in less than 1 h. In contrast, catecholborane in tetrahydrofliran was stable in the presence of nickel(II), cobalt(II) and iron(H) chloride complexes with dppe. 

A tellurium-containing borane without carbon atoms in the Te — B cage was obtained from B10H14 and sodium polytelluride. The telluraborane BioHjjTe was used for the preparation of cobalt, iron, platinum, rhodium, and iridium complexes, in which the TeBioHjo moiety served as the ligand. 

Like the double bond, the carbon-carbon triple bond is susceptible to many of the common addition reactions. In some cases, such as reduction, hydroboration and acid-catalyzed hydration, it is even more reactive. A very efficient method for the protection of the triple bond is found in the alkynedicobalt hexacarbonyl complexes (.e.g. 117 and 118), readily formed by the reaction of the respective alkyne with dicobalt octacarbonyl. In eneynes this complexation is specific for the triple bond. The remaining alkenes can be reduced with diimide or borane as is illustrated for the ethynylation product (116) of 5-dehydro androsterone in Scheme 107. Alkynic alkenes and alcohols complexed in this way show an increased structural stability. This has been used for the construction of a variety of substituted alkynic compounds uncontaminated by allenic isomers (Scheme 107) and in syntheses of insect pheromones. From the protecting cobalt clusters, the parent alkynes can easily be regenerated by treatment with iron(III) nitrate, ammonium cerium nitrate or trimethylamine A -oxide. ° ... 

This article describes two syntheses the bis(carbaborane)iron(III) complex and the conversion of this compound to the neutral tetracarbon carborane. Both procedures generate high yields of product and entail normal vacuum-line synthetic techniques. The starting material, 2,3-diethyl-2,3-dicarba-m cfo-hexa-borane(8) can be obtained by the procedure described in the preceding article. 

Caution. The reaction must be run in a hood because of the toxicity of the borane complex and iron carbonyls. 

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