Method for producing compound, polymer, composition, and pattern formation method

A method for producing a compound A represented by the following formula (1):

• wherein
• each X is independently I, F, Cl, Br, or an organic group having 1 to 30 carbon atoms and having 1 or more and 5 or less substituents selected from the group consisting of I, F, Cl, and Br;
• each L1 is independently a single bond, an ether group, an ester group, a thioether group, an amino group, a thioester group, an acetal group, a urethane group, a urea group, an amide group, or an imide group, and the ether group, the ester group, the thioether group, the amino group, the thioester group, the acetal group, the urethane group, the urea group, the amide group, and the imide group of L1 optionally have a substituent;
• each Y is independently a hydroxyl group, an alkoxy group, an ester group, an acetal group, a carboxyalkoxy group, a carbonate ester group, a nitro group, an amino group, a carboxyl group, a thiol group, an ether group, a thioether group, a phosphine group, a phosphone group, a urethane group, a urea group, an amide group, an imide group, or a phosphate group, and the alkoxy group, the ester group, the carbonate ester group, the amino group, the ether group, the thioether group, the phosphine group, the phosphone group, the urethane group, the urea group, the amide group, the imide group, and the phosphate group of Y optionally have a substituent;
• each of Ra, Rb, and Rc is independently H, I, F, Cl, Br, or an organic group having 1 to 18 carbon atoms and optionally having a substituent;
• A is an organic group having 6 to 30 carbon atoms;
• each Z is independently an alkoxy group, an ester group, an acetal group, a carboxyalkoxy group, or a carbonate ester group, and the alkoxy group, the ester group, the acetal group, the carboxyalkoxy group, or the carbonate ester group of Z optionally has a substituent;
• and
• p is an integer of 1 or more, m is an integer of 1 or more, n is an integer of 0 or more, and r is an integer of 0 or more;
• the method comprising at least one of step HX, step ST, and step PR:
• step HX:
• a step of introducing a halogen or a group containing a halogen,
• step ST:
• a step of introducing an unsaturated double bond, and
• step PR:
• a step of introducing a group represented by the following formula (Y-0):
• wherein each L0 is independently one or more groups selected from the group consisting of an alkoxy group, an ester group, an ether group, a thioether group, an acetal group, a thioacetal group, a carboxyalkoxy group, a carbonate ester group, a sulfonyl group, and a silyl group, or a hydrolyzable group.