received in UK for publication 4 August 1969) A number of chemical conversions most notably the Wittig reactionare best formlated as proceeding through a four-membered cyclic transition state or intermediate. We wish to report a new class of such conversions : The reaction of ketimine anions with ca
Carbonyl and thiocarbonyl compounds. XII. Synthetic Experiments with Diazoxanthenes
β Scribed by Dr. N. Latif; Dr. I. Zeid; Dr. N. Mishriky
- Publisher
- John Wiley and Sons
- Year
- 1970
- Tongue
- English
- Weight
- 271 KB
- Volume
- 312
- Category
- Article
- ISSN
- 1615-4150
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## Abstract For Abstract see ChemInform Abstract in Full Text.
in DMF hampered the measurement of its transient spectra, we examined the dynamics of the photoexcited states of 2 and 4 in DMF. The energy levels of the ion pairs were calculated to be 1.41 eV for Dp+-Hp--Im and 1.19 eV for Dp'-Hp-Im-. Analysis of the transient absorption spectra of 2 and 4 reveals
## Abstract While 4βchloroxanthione **1** gives with diazomethane the dithiol **2**, it reacts with other diazoalkanes to give the episulfides **3**β**5**, desulfurization of which forms the ethylenes **6** and **7**. Malononitrile and ethyl cyanoacetate react with **1** to give the cyano derivativ
## Abstract Prenyllithium (3βmethylbutβ2βenylβlithium) (**1**) and __cis__βcrotyllithium (__Z__βbutβ2βenylβlithium) (**2**) in tetrahydrofuran solution, prepared according to the method of __Eisch__ & __Jacobs__, react with carbonyl compounds to give the branched alcoholates with moderate to high s