This was found in russian archives of manuscripts:
2C-H from 2,5-diMethoxyBromoBensene:
Place 7g of Mg chips, washing with CCl4, and 400ml of anhydrous Et2O in a round-bottomed 1l flask, equipped with additional funnel. 64,6g of 2,5-diMethoxyBromoBensene was dripped. An iodine crystal being added to initiate Grignard rxn. Reaction begins after 4 hours and more amount of Mg dissolves. 15,5 of Ethyleneimine in 30ml of anhydrous Et2O was added and mixture was kept at room temperature for a hour. After mixture was placed to 300ml of 10% H2SO4. Organic layer was separated; aqueous was extracted with chloroform (50ml), after that was poured with solution of NaOH till ph = 12-13, precipitate was filtered out and washed with chloroform, and filtrate was also extracted with chloroform (3x50ml). Combined extractions were dried over MgSO4 and chloroform was evaporated in vacuum. Yield is 1,7g of light oil of 2C-H.
(I hope it was misprint in original text and yield was 17g of product indeed, but nobody knows it, because author of this pretty article was disappeared to obscurity ).
Is is a pity, that prepare the grignard reagent from 4-bromo-2,5-dimethoxytoluene is futile we would prepare 2C-D this way But, anyway, I think it's very interesting method for 2C-B and some other PEAs preparation...
enjoy.
Oh, russian archives of manuscripts, mentioned above, has description of synth of Ethyleneimine (from monoethanolamine and H2SO4) too. But, sorry, I have really no time to translate and post it now. May be, Antoncho will do it?
Matrix... may tricks?