Snapdragon Chemistry is happy to provide these compounds in quantities of 10s to 100s of grams.  The scalable flow technology for production of larger quantities can be produced under contract.

 
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VINYLMAGNESIUM BROMIDE SOLUTION 1M IN THF

CAS Number 1826-67-1

Molecular Formula C2H3BrMg

 
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1,2-CYCLOBUTANEDICARBOXYLIC ANHYDRIDE

CAS Number 4462-96-8

Molecular Formula C6H6O3

Other Names:  2-Oxabicyclo[3.2.0]heptane-2,4-dione; 1,2-Cyclobutanedicarboxylic acid anydride

 
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ALLENYLBORANE PINACOL ESTER

CAS Number 865350-17-0

Molecular Formula C9H15BO2

Other Names:1,3,2-Dioxaborolane, 4,4,5,5-tetramethyl-2-(1,2-propadien-1-yl)

 
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Allenyltrifluoroborate Postassium Salt

CAS Number 1201899-21-9

Molecular Formula C3H3BF3K

Other Names:  Borate(1-), trifluoro-1,2-propadien-1-yl, potassium (1:1)