No abstract

The electrophiles bromine, bromine chloride, chlorine, acetyl hypochlorite, and acetyl hypobromite all yield substantial cis addition product by reaction with indene (1) in aprotic solvents, showing that the direct syn collapse of ion pairs obtained from bromine and similar electrophiles is readily possible. The cis to trans ratios with the halogens (but not with the acyl hypohalites) vary with solvent polarities. In the low-polarity solvents (hydrocarbons and carbon tetrachloride) much more syn addition occurs at high halogen concentration. Syn addition of the above electrophiles to 1 as well as methyl hypobromite and methyl hypochlorite was also observed in methanol and acetic acid, with the exception of bromination in methanol where only the trans-dibromide was obtained.

We routinely performed intravenous dipyridamole thallium imaging and resting radionuclide ventriculography on 190 patients being considered for elective vascular procedures. Patients with thallium redistribution underwent coronary arteriography. Patients in group 1 (n = 78) had clinical evidence of coronary artery disease, and patients in group 2 (n = 112) had no history or electrocardiographic evidence of coronary artery disease. The frequency of thallium redistribution was not significantly different in the two groups (45% in group 1 and 46% in group 2). Coronary arteriography identified severe three-vessel or left main disease in eight patients (10%) in group 1 and 16 patients (14%) in group 2. Selection of patients for dipyridamole thallium imaging prior to vascular reconstruction should be based on whether or not documentation of the extent of coronary artery disease would influence therapy rather than on clinical indicators of coronary disease.

Die Addition verschiedener elektrophiler Reagentien an Inden (I) zu den Addukten (II) und (III) wird untersucht.