1,2-Dimethyldiborane

1,2-Dimethyldiborane
	; cis-1,2-Dimethyldiborane
	; trans-1,2-Dimethyldiborane
Names
	Preferred IUPAC name 1,2-Dimethyldiborane(6)
	Other names Symmetrical dimethyldiborane
Identifiers
CAS Number	17156-88-6 ;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/C2H10B2/c1-3-5-4(2)6-3/h3-4H,1-2H3 Key: CMZSWMSJMMTTMF-UHFFFAOYSA-N;
	SMILES C[BH]1[H][BH](C)[H]1;
Properties
Chemical formula	(CH3BH2)2
Molar mass	55.72 g mol−1
Appearance	Colorless gas
Melting point	−124.9 °C (−192.8 °F; 148.2 K)
Boiling point	4 °C (39 °F; 277 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). (what is ?) Infobox references

1,2-Dimethyldiborane is an organoboron compound with the formula [(CH₃)BH₂]₂. Structurally, it is related to diborane, but with methyl groups replacing terminal hydrides on each boron. It is the dimer of methylborane, CH₃BH₂, the simplest alkylborane. 1,2-Dimethyldiborane can exist in a cis- and a trans arrangement. 1,2-Dimethyldiborane is an easily condensed, colorless gas that ignites spontaneously in air.

An isomer of 1,2-dimethyldiborane is 1,1-dimethyldiborane, known as unsymmetrical dimethyldiborane, which has two methyl groups on one boron atom. Other methylated versions of diborane including methyldiborane, trimethyldiborane, tetramethyldiborane. Trimethylborane exists as a monomer.

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