Fluorine-containing ether compound, surface treatment agent, fluorine-containing ether composition, coating liquid, article, and compound

A fluorine-containing ether composition comprising:

• a fluorine-containing ether compound represented by the following formula (A1);
• and
• a fluorine-containing ether compound represented by the following formula (A2):
• Rf—O—(Rf1O)m—Rf2[—R1—C(—R2-T)a(-R3)3-a]b Formula (A1)
• [(T-R2—)a(R3—)3-aC—R1—]bRf2—O—(Rf1O)m—Rf2[—R1—C(—R2-T)a(-R3)3-a]b Formula (A2)
• wherein
• Rf is a fluoroalkyl group having 1 to 20 carbon atoms,
• Rf1 is a fluoroalkylene group having 1 to 6 carbon atoms,
• Rf2 is an organic group having a valence of (1+b), where at least a carbon atom bonded to R1 bonds to a fluorine atom, and when there is a plurality of Rf2, the Rf2 may be the same or different,
• R1 is an alkylene group having 1 to 20 carbon atoms, and when there is a plurality of the R1 may be the same or different,
• R2 is an alkylene group having 2 to 10 carbon atoms and optionally a fluorine atom, and a plurality of R2 may be the same or different,
• R3 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms and optionally a fluorine atom, and when there is a plurality of R3, the plurality of R3 may be the same or different,
• T is —Si(R)3-c(L)c, and a plurality of T may be the same or different,
• R is an alkyl group,
• L is a hydrolytic group or a hydroxyl group, and 2 or more L in T may be the same or different,
• m is an integer from 1 to 20,
• a is an integer from 1 to 3, and when there is a plurality of a, the plurality of a may be the same or different,
• b is an integer of 1 or more, and when there is a plurality of b, the plurality of b may be the same or different,
• c is 2 or 3, and a plurality of c may be the same or different, and
• when b is 1, a is 2 or 3.

A compound represented by the following formula (B1):

• (CH2═CH—R20—)a(R3—)3-aC—R21—X Formula (B1)
• wherein
• R20 is a single bond or an alkylene group having 1 to 8 carbon atoms and optionally a fluorine atom, and when there is a plurality of R20, the plurality of R20 may be the same or different,
• R21 is a single bond or an alkylene group having 1 to 19 carbon atoms,
• R3 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms and optionally a fluorine atom, and when there is a plurality of R3, the plurality of R3 may be the same or different,
• X is a chlorine atom, a bromine atom, or an iodine atom, and
• a is an integer from 1 to 3.

A compound represented by the following formula (B2):

• (CH2═CH—R20—)a(R3—)3-aC—R21—MgX Formula (B2)
• wherein
• R20 is a single bond or an alkylene group having 1 to 8 carbon atoms and optionally a fluorine atom, and when there is a plurality of R20, the plurality of R20 may be the same or different,
• R21 is a single bond or an alkylene group having 1 to 19 carbon atoms,
• R3 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms and optionally a fluorine atom, and when there is a plurality of R3, the plurality of R3 may be the same or different,
• X is a chlorine atom, a bromine atom, or an iodine atom, and
• a is an integer from 1 to 3.