Trimethylenemethane-Reactivity and Stereochemistry

نویسندگان

چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Photoelectron Spectroscopy of the Trimethylenemethane Negative Ion

The photoelectron spectrum of the trimethylenemethane (TMM) negative ion is described. The electron affinity of TMM is found from the spectrum to be 0.431 6 0.006 eV, and the energy difference between the X̃ A9 2 and b̃ A1 states of TMM is determined to be 16.1 6 0.2 kcal/mol. The energy difference between the lowest energy triplet and singlet states is estimated to be 13–16 kcal/mol. The enthalp...

متن کامل

Monoaza-analogs† of trimethylenemethane. Isoelectronic similarities and differences

Organic molecules characterized by high-spin ground states are of interest for many reasons, including their potential use as spin reservoirs in ferromagnetic organic materials. For the design of high-spin organic molecules having an even number of electrons, one typically tries to take advantage of Hund’s rule 4 in constructing systems biased towards having triplet ground states. That is, one ...

متن کامل

Epimerization and stereochemistry of avoparcin.

The epimerization of avoparcin entities is discussed in some detail. The absolute stereochemistry of avoparcin is now known since the N-methyl terminal amino acid of the aglycone has been isolated and shown to exhibit negative optical rotation and hence has the R-configuration. The same amino acid has been isolated from an epimerized solution of avoparcin and found to have positive rotation and...

متن کامل

Mechanistic inferences from stereochemistry.

I am still impressed that the textbook language of organic chemistry is so successful in explaining the reactions that we find in nature. Thismight not have been anticipated because we find that biological reactions are invariably stereospecific whereas nonbiological reactions are invariably not. This realization came to light about 150 years ago when Pasteur found that only half of chemically ...

متن کامل

Radical cation of a trimethylenemethane with a nondegenerate ground state.

Upon ionization by gamma-irradiation in frozen CFCl(3), or by X-irradiation in an Ar matrix, 2,2,3,3-tetramethylmethylenecyclopropane (MCP-Me4) readily undergoes ring opening to yield the radical cation of 1,1,2,2-tetramethyltrimethylenemethane (TMM-Me4). The hyperfine-coupling constants for TMM-Me4(.+) are (mT) -1.99 (2H), +0.53 (6H), and +0.19 (6H), and the singly occupied orbital closely res...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Journal of Synthetic Organic Chemistry, Japan

سال: 1973

ISSN: 0037-9980,1883-6526

DOI: 10.5059/yukigoseikyokaishi.31.635