عنوان

Cycloaddition reactions of a heterocyclic nitrone

شماره

TLpq230749044

زبان متن نوشتاري يا گفتاري و مانند آن

انگلیسی

عنوان اصلي

Cycloaddition reactions of a heterocyclic nitrone

نام عام مواد

[Thesis]

نام نخستين پديدآور

H. A. S. Al-Muallem

نام ناشر، پخش کننده و غيره

King Fahd University of Petroleum and Minerals (Saudi Arabia)

تاریخ نشرو بخش و غیره

1992

نام خاص و کميت اثر

180

جزئيات پايان نامه و نوع درجه آن

M.S.

کسي که مدرک را اعطا کرده

King Fahd University of Petroleum and Minerals (Saudi Arabia)

امتياز متن

1992

متن يادداشت

A study of the regiochemical and stereochemical behavior of the addition reaction of a heterocyclic nitrone, 5,6-dihydro-1,4-oxazine 4-oxide with a series of alkenes has been carried out. The high degree of regiochemical control in these concerted reactions has been explained in terms of frontier molecular orbital treatment. Rate constants for the cycloaddition of the heterocyclic nitrone with several alkenes have been determined at 36C by H NMR spectroscopy. Differences in the rates of cycloadditions have been explained in terms of combination of various factors. The barrier to nitrogen inversion in the nitrone cycloaddition products has been determined by detailed band shape analysis of proton and carbon NMR spectra. The chair inversion has been slowed, in one case to show the presence of the two forms of the cis isomers. The major conformational isomer is shown to be the cis conformer, which is in equilibrium with the minor trans conformer. A mechanistic study of peracid induced ring opening of several cycloadducts has been carried out. (Abstract shortened by UMI.)

موضوع مستند نشده

Chemistry

موضوع مستند نشده

Chemistry

موضوع مستند نشده

Organic chemistry

موضوع مستند نشده

Pure sciences

مستند نام اشخاص تاييد نشده

H. A. S. Al-Muallem

نام الکترونيکي

فرمت انتشار

p

نوع ماده

[Thesis]

کد کاربرگه

276903

سطح دسترسي

a

تكميل شده

Y