Material for forming underlayer film for lithography, composition for forming underlayer film for lithography, underlayer film for lithography and production method thereof, pattern forming method, resin, and purification method

Abstract

The present embodiment provides a material for forming an underlayer film for lithography, containing at least any of a compound represented by following formula (1) or a resin including a structural unit derived from a compound represented by the following formula (1), wherein Rrepresents a 2n-valent group having 1 to 60 carbon atoms, or a single bond, each Rindependently represents a halogen atom, a straight, branched or cyclic alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 30 carbon atoms, a thiol group, a hydroxyl group, or a group where a hydrogen atom of a hydroxyl group is substituted with an acid-dissociable group, and may be the same or different in the same naphthalene ring or benzene ring, in which at least one Rrepresents a group where a hydrogen atom of a hydroxyl group is substituted with an acid-dissociable group, n is an integer of 1 to 4, and structural formulae of n structural units in square brackets [ ] may be the same or different when n is an integer of 2 or more, X represents an oxygen atom, a sulfur atom, or a non-bridging group, each mis independently an integer of 0 to 7, provided that at least one mis an integer of 1 to 7, and each q is independently 0 or 1.