This is from Berichte (D. Chem. Gesell.) 45 (1912) p. 505 :
As pointed out earlier in this thread, great care should be taken when working with diazomethane. It should only be handled by a well-trained professional chemist.
Experimental part
In a bromination flask fitted with an Allihn condensor is added a solution of 50 gr (4 Mol.) potassium hydroxide in 150 ccm absolute alcohol and a solution of 10 gr (1 Mol.) hydrazin in 50 ccm absolute alcohol. To this hot solution is added dropwise with an addition funnel a solution of 30 gr chloroform (1.25 Mol.) in 50 ccm absolute alcohol, at a rate which caused a controllable (not too vigorous) reaction to occur. The end of the addition funnel must be kept appropriately under the surface of the solution all the time, as to minimize the evaporation of the chloroform. During the reaction a constant steam of nitrogen gas was passed through the apparatus. The alcohol fumes are condensed by the condensor, while the diazomethane is carried through by the stream of nitrogen into a well cooled solution of ether. The yield of diazomethane is ca. 25%. The solutions thus prepared can be used in methylation reactions as is.
The reaction proceeds through this equation:
NH2NH2 + CHCl3 + 3KOH __> :CNNH2 + 3KCl + 3H2O
:CNNH2 __> CH2N2
If an excess of chloroform and KOH is used, isonitrile is formed:
NH2NH2 + 2CHCl3 + 6KOH __> :CN2C: + 6KCl + 6H2O
Acetophenone to phenylacetone: PhCOCH3 + CH2N2 --AlCl3--> P2P (50%)
Katalysierte Homologisierung Cycloaliphatischer und Aliphatischer Ketone mit Diazoalkanen
Eugen Müller, Martin Bauer
Ann. Chem. 654, 92-111 (1962) https://www.thevespiary.org/rhodium/Rhodium/pdf/diazomethane.ketone.homologation.pdf (https://www.thevespiary.org/rhodium/Rhodium/pdf/diazomethane.ketone.homologation.pdf)
(edited, forgot to mention the condensor ::) )
A rapid, safe and convenient procedure for the preparation and use of diazomethane
P. Lombardi
Chemistry & Industry 708 (1990) (https://www.thevespiary.org/rhodium/Rhodium/chemistry/diazald.html)
(https://www.thevespiary.org/rhodium/Rhodium/chemistry/diazald.html)