When the so-called IUPAC Blue Book ‘Nomenclature of Organic Chemistry (IUPAC Recommendations and Preferred IUPAC Names 2013)’ was last published in 2014, it greatly expanded the coverage of the previous edition (1979) and included for the first time recommendations for a preferred IUPAC name (PIN) for those needing a consistent name. Still and for use in general nomenclature, alternative unambiguous names were included.
That edition of the Blue Book was prepared over many years and inevitably was not totally consistent. Since its publication, corrections, changes and modifications have been listed on the following webpage: https://iupac.qmul.ac.uk/bibliog/BBerrors.html. A html version of the whole book including all corrections, changes and modifications has been prepared; it also includes a PDF of each chapter and a combined PDF of the whole book. Version 2, released on 1 April 2022 is available at https://iupac.qmul.ac.uk/BlueBook/PDF/