r - Adding single quotes to column in data frame -

i have df multiple columns have many rows. want take 1 column , add single quotes around values , comma afterwards.

 
 column x 111111 222222 333333 444444   
 

what wanted like:

 
 column x '111111', '222222', '333333', '444444', 
 

if column df$x do:

df$x <- paste0("'", df$x, "',")