Abstract: An aortic aneurysm has few noticeable symptoms and is at high risk of rupture without a sign of abnormality. Further, if the aortic aneurysm ruptures, it causes a shock state due to massive blood loss and results in a very low survival rate. Thus, when the aortic aneurysm is found by physical examination or the like, surgery with a stent graft or the like needs to be performed according to the state of its progression. A pharmaceutical composition for preventing and treating an aortic aneurysm including a medium chain fatty acid as a main component has an effect of inhibiting the occurrence and progression of the aortic aneurysm. Thus, when the aortic aneurysm is found, continuous intake of the composition can not only inhibit the progression of the aortic aneurysm but also mediate the regression of the aortic aneurysm, thereby producing the effect of improving vital prognosis.

Abstract: There is disclosed a process for producing silanes by reducing polyhalosilane with a mixture of alkyl aluminum hydride and trialkyl aluminum, in which a treatment for reducing the content of trialkyl aluminum in the mixture is lowered to 10 mol. % or less of alkyl aluminum hydride prior to the reduction reaction.As to methods for reducing the content of trialkyl aluminum in the mixture, there are provided, for example, distillation, recrystallization, separation by complex formation, pyrolysis of trialkyl aluminum and decomposition by hydrogenation of trialkyl aluminum.