Abstract: The present invention provides a dimethylaluminum hydride composition having a low viscosity at normal temperature, comprising dimethylaluminum hydride and at least one Lewis base in an amount of from about 0.001 to about 10% by weight based on dimethylaluminum hydride. The resulting dimethylaluminum hydride composition is superior in handling properties. The present invention also provides a method for reducing the viscosity of dimethylaluminum hydride.

Abstract: The present invention provides a process for removing an oxygen-containing component in a crude organometallic compound consisting essentially of an organometallic compound of the general formula (1):R.sub.1 R.sub.2 MX (1)wherein R.sub.1 and R.sub.2 independently represent an alkyl group or a cycloalkadienyl group, M represents a Ga atom or an In atom and X represents an alkyl group, a halogen atom or a hydrogen atom, and the oxygen-containing component as an impurity, which comprises the steps of mixing the crude organometallic compound and an alkali halide in an amount of 0.1 to 10% by weight of the crude organometallic compound, heat-treating the mixture, and vaporizing the organometallic compound for separation, the steps being carried out in a substantially oxygen-free atmosphere.

Abstract: According to the process of the present invention, trialkylarsenic compounds having a very high purity of usually over 99% can be obtained by using inexpensive, easily available arsenic oxides and without any complicated operations. The trialkylarsenic compounds thus obtained can be effectively used as a material for compound semiconductors in the field of electronic industry as well as in the field of various chemical industries, and are of great industrial value.

Abstract: A method for purifying an organometallic compound in which an organometallic compound of gallium, aluminum or indium is contacted with at least one metal selected from metallic sodium, metallic potassium and a sodium-potassium alloy. This method is especially efficacious when the high-purity organometallic compound is used as a semiconductor because, by the disclosed method, the silicon components are removed as impurities, which silicon material tends to lower the electrical characteristics of the semiconductor.

Abstract: Powdery alumina hydrate is produced from an alkylaluminum compound by hydrolysis of the alkylaluminum compound by water through the following steps; converting the alkylaluminum compound to an ether complex compound: partially hydrolyzing the ether complex compound in the presence of an non-reactive solvent at a temperature of not higher than about 150.degree.C with stirring so that no alumina hydrate is precipitated until at least 0.8 moles of water reacts with one mole of the alkylaluminum compound, thereby forming polyaluminoxane; completely hydrolyzing the resulting polyaluminoxane at a concentration of not more than about 3.0 grams-atoms as aluminum per liter of non-reactive solvent at a temperature of about 10.degree. to about 150.degree.C with stirring, so that one mole of the feed alkylaluminum compound may be ultimately hydrolyzed completely with 2 to 10 moles of water, thereby precipitating alumina hydrate; and then separating the resulting alumina hydrate from the non-reactive solvent.