1.4- Thiazines physicochemical properties

In the following sections, physicochemical properties, syntheses, reactions, and the utilization of the most important compounds are discussed. Within the individual sections, the pyrido[l,2-h][l,2]oxazines and their ben-zologs, followed by pyrido[l,2-ft][l,2]thiazines, pyrido[l,2-h]pyridazines, and their benzologs, are dealt with. 

Although the subject of brief surveys, " the chemistry of mono-cyclic 1,4-thiazines has not previously been discussed in a comprehensive manner. The aim of this review is to consider the synthesis, reactivity, and physicochemical properties of these compounds and their dihydro derivatives. 

In the following sections the physicochemical and spectroscopic properties, reactions, syntheses, and, more briefly, utilization of these ring systems are discussed. Within the individual sections the pyrido[2,l-b][l,3]oxazines and their benzologs and pyrido[2,l-b][l,3]thiazines and their benzologs are dealt with. 

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