The 3-methyl derivative 3-methyl-4-nitroimino-perhydro-1,3,5-oxadiazine, CAS #153719-38-1, seems to be a stable solid and a common pesticide ingredient. If you could convert your supposed 4-nitroimino-perhydro-1,3,5-oxadiazine to a known derivative such as this by reaction with an alkyl halide, that would indicate that you do indeed have the correct precursor. But substitution may occur preferentially at the 5 position if the 3 position is more hindered by the nitro group.
Does a literature search on 4-nitroimino-perhydro-1,3,5-oxadiazine turn up anything? I mean a search through Chem Abstracts, for example, that's the only way to get reliable information. If you don't have access to a good university library, you're in a tough spot. Given the competitive nature of the field (pesticide chemistry) I would imagine such information would not be volunteered very freely on the Internet, except by guys like me that have no vested interest and unfortunately not much useful info to share on the subject either!
I find your project to be a very interesting one, and very challenging given the complexities of the reactions involved. As you say, the compound may be inherently unstable, which would explain the lack of direct references.
Steve
A few links, mainly for my own reference; I'm sure you know these works very well!
The Pesticide Manual, 10th Edition (1994), The British Crop Protection Council, London
(Cited frequently in the patent descriptions.)
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