	US 12,479,867 B2
	Processes for synthesizing unsymmetrical disiloxanes
Xiaoyuan Zhou, Midland, MI (US); Zhanjie Li, Midland, MI (US); and Eric Joffre, Midland, MI (US)
Assigned to DOW SILICONES CORPORATION, Midland, MI (US)
Appl. No. 17/784,084
Filed by DOW SILICONES CORPORATION, Midland, MI (US)
PCT Filed Dec. 11, 2020, PCT No. PCT/US2020/064526 § 371(c)(1), (2) Date Jun. 9, 2022, PCT Pub. No. WO2021/119437, PCT Pub. Date Jun. 17, 2021.
Claims priority of provisional application 62/947,653, filed on Dec. 13, 2019.
Prior Publication US 2023/0099625 A1, Mar. 30, 2023
Int. Cl. C07F 7/08 (2006.01)

CPC C07F 7/0874 (2013.01)

20 Claims

1. A process for making alkenyl disiloxanes, comprising:

combining an alkenyl halosilane with an alkyl halosilane and adding the mixture to water, an acidic aqueous solution, or a basic aqueous solution, wherein:

the alkenyl halosilane has Formula A

and

the alkyl halosilane has Formula B

wherein:

X is, independently at each occurrence, F, Cl, Br or I;

n is 0, 1, 2, 3, 4, 5, or 6;

R¹is, independently at each occurrence, H or C1-C3 alkyl;

R²is, independently at each occurrence, H or C1-C3 alkyl;

also provided that one or more of R¹and one or more of R²can combine to form a ring;

R³is, independently at each occurrence, H or C1-C6 alkyl;

one R⁴is H; and

each remaining R⁴are C1-C3 alkyl at each occurrence.