  We present near-infrared spectra of seven radio-loud quasars with a median
redshift of 2.1, five of which were previously known to have Ly alpha nebulae.
Extended [OIII]5007 and H alpha emission are evident around six objects, at the
level of a few times 1E-16 erg/cm^2/arcsec^2/s within 2 arcsec of the nucleus
(16 kpc in the adopted cosmology). Nuclear [OII]3727 is detected in three of
the 5 quasars studied at this wavelength, and clearly extended in one of them.
  The extended [OIII] tends to be brighter on the side of the nucleus with the
stronger, jet-like radio emission, indicating at least that the extranuclear
gas is distributed anisotropically. It is also redshifted by several hundred
km/s from the nuclear [OIII], perhaps because the latter is blueshifted from
the systemic velocity of the host galaxy. Alternatively, the velocity shifts
could be due to infall (which is suggested by line widths ~1000 km/s FWHM) in
combination with a suitable dust geometry. Lyalpha/Halpha ratios well below the
case B value suggest that some dust is present.
  Photoionization modelling of the [OIII]/[OII] ratios in the extended gas
suggests that its pressure is around or less than a few times 1E7 cm^-3 K; any
confining intracluster medium may thus host a strong cooling flow. A comparison
with lower-redshift work suggests that there has been little evolution in the
nuclear emission line properties of radio-loud quasars between redshifts 1 and
2.
