2009), even though cyclisation
of aliphatic precursors may also play a role (Gonzalez-Vila and Martin 1985).
It was noted that the cyclisation
of diacetyl monosemicarbazone to the corresponding triazine required refluxing in 2M sodium hydroxide.
Project involves manufacturing of fragrance from organic raw materials by chemical process like hydrogenation, esterification, Diels-Alder reaction, cyclisation
, dehydrogenation, aldol condensation etc.
A prominent analogue of penitrem A (15), pennigritrem (29), has been resolved from the tremorgenic alkaloids of a strain of Penicillium nigricans, which has been shown to involve the terminal diterpenoid isoprene during cyclisation
, a unique process among fungal indole-diterpenoids.
All the five triphenodioxazines were prepared by the oxidative cyclisation of the benzoquinone intermediates.
By the general procedure, oxidative cyclisation of the benzoquinone 1A gave the TPDO 1B.
By employing the general procedure, oxidative cyclisation of the benzoquinone 3A gave the TPDO 3B.
Considering the similarities and differences of these two molecules the degree of cyclisation
of the bibenzyl skeleton as well as the substitution pattern of the hydroxy- and methoxy groups may play an important role in the mechanism involved in their microtubule depolymerising activity and influence the cytotoxic and anti-protozoal potential.
Hutt, Iodobenzene catalysed synthesis of spirofurans and benzopyrans by oxidative cyclisation
of vinylogous esters, Chem.
psi]-carotene) by hydrogenation, dehydrogenation, cyclisation
, oxidation, or by a combination of these processes.
The (alpha)- aminyl radicals containing alkene side chains are found to undergo 5-exo-trig cyclisation
reaction to yield nitrogen containing heterocycles.
Triterpenoids like the steroids are formed in nature by the cyclisation
of squalene with the retentions of all 30 carbon atoms in the molecule such as oleanolic acid and ursolic acid.