Just wanted to ask about Phenidone, since more and more esoteric names for this has started to fly:

I have phenidone from Photograpic Formulary
Cat no 10-0870
CAS no 92-43-3

I have done some searching:

- Dimezone (4,4 Dimethyl 1 Phenyl 3 Pyrazolidone)
- Dimezone S (4 HydroxyMethyl 4 Methyl 1 Phenyl 3 Pyrazolidone)


- Phenidone A (1 Phenyl 3 Pyrazolidone)
- Phenidone B (4 Methyl 1 Phenyl Pyrazolidone)

Dimezone S is almost as active as the original
Phenidone but with lower level of fog.



?Name? Dimezone, Phenidone D


4,4-Dimethyl-1-phenyl-3-pyrazolidone
?CAS?

2654-58-2
?Synonyms?

4,4-DIMETHYL-1-PHENYL-3-PYRAZOLIDINONE
4,4'-DIMETHYL-1-PHENYL-3-PYRAZOLIDONE
4,4-DIMETHYL-1-PHENYL-3-PYRAZOLIDONE
DIMEZONE
DIMEZORE
LABOTEST-BB LT00440816
TIMTEC-BB SBB003657
4,4-dimethyl-1-phenyl-3-pyrazolidinon
4,4-dimethylphenidone
nsc215239
4,4-Dimethyl-1-phenyl-3-pyrozolidinone
4,4-Dimethyl-1-phenyl-3-pyrazolidione
3-Pyrazolidinone, 4,4-dimethyl-1-phenyl-
4,4-Dimethyl-1-phenyl-3-pyrazolidone (Dimezone)
4,4-Dimethyl-1-phenyl-3-pyrazolidon
4,4-DIMETHYL-1-PHENYL-3-PYRAZOLIDONE DIMESON
Phenidone D
DIMEZONE (4,4-DIMETHYL-1-PHENYL-3-PYRAZOLIDINONE)
dimethyl-phenylpyrazolidine DPP
4,4-Dimethyl-1-phenylpyrazolidin-3-one


Mol-weight.
Phenidone-A : 162.19
Dimezone, or phenidone-D : 190.24
Dimezone-S : 206.24

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To me it seems obvious it is very important to know what type of Phenidone one has, and adjust the recipes for this, if comparing notes shall serve any meaningful purpose at all.