The following information was submitted:
Transactions: WSEAS Transactions
Transactions ID Number: 18-114
Full Name: Nigel Aylward
Position: Researcher
Age: ON
Sex: Male
Address: 7 greenhill grove, daisy hill, queensland 4127
Country: AUSTRALIA
Tel: 61732081336
Tel prefix:
Fax:
E-mail address: samkin_aylward@yahoo.com.au
Other E-mails: lumicao@gmail.com
Title of the Paper: A plausible route to a prebiotic synthesis of l-histidine
Authors as they appear in the Paper: nigel aylward
Email addresses of all the authors: samkin_aylward@yahoo.com.au
Number of paper pages: 10
Abstract: Possible reactions in a mildly reducing prebiotic atmosphere of ammonia and hydrogen cyanide produce cyanamide, its isomer carbodiimide, and formamidine. Alkynes such as diacetylene may form very weak van der Waals complexes with metal derivatives of porphin that acts as a potent photochemical catalyst. The reactants carbodiimide and the diacetylene adduct with magnesium porphin may react spontaneously to form an iminazole structure. Subsequent reaction with ammonia leads to an aziridine derivative. Prototropic shifts lead to an opening of the ring and finally an imine bound to the catalyst. Carbon monoxide gas may also bind to porphin with either the metal ion or in the form of an aziridine-2one complex. If this has been determined by the magnetic field of the exciting ultraviolet radiation to have a particular orientation and is present as a high energy compound, photochemical excitation may easily lead to the migration of the carbon monoxide from the surface o!
f the porphin ring to the imine group of the iminazole adduct. Subsequent hydrolysis gives the L-histidine which forms the zwitterion. The reactions have been shown to be feasible from the overall enthalpy changes in the ZKE approximation at the HF and MP2 /6-31G* level, and with acceptable activation energies.
Keywords: L-histidine diacetylene carbodiimide formamidine cyanamide.
EXTENSION of the file: .doc
Special (Invited) Session: a prebiotic synthesis of l-histidine
Organizer of the Session: 659-332
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